Mathematics
Q. Find the maximum value of the function f(x) = -2x^2 + 8x - 3. (2021) 2021
Solution
The function is a downward-opening parabola. The maximum occurs at x = -b/(2a) = -8/(2*-2) = 2. f(2) = -2(2^2) + 8(2) - 3 = 8.
Correct Answer: B — 8
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Q. Find the midpoint of the line segment joining the points (2, 3) and (4, 7). (2022) 2022
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A.
(3, 5)
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B.
(2, 5)
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C.
(4, 5)
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D.
(3, 4)
Solution
Midpoint = ((2+4)/2, (3+7)/2) = (3, 5).
Correct Answer: A — (3, 5)
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Q. Find the minimum value of f(x) = x^2 - 4x + 7. (2021)
Solution
The vertex form gives the minimum at x = 2. f(2) = 2^2 - 4*2 + 7 = 3.
Correct Answer: A — 3
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Q. Find the minimum value of f(x) = x^2 - 4x + 7. (2021) 2021
Solution
The vertex form gives the minimum at x = 2. f(2) = 2^2 - 4*2 + 7 = 3.
Correct Answer: A — 3
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Q. Find the minimum value of the function f(x) = 2x^2 - 8x + 10. (2022)
Solution
The minimum occurs at x = 2. f(2) = 2(2^2) - 8(2) + 10 = 6.
Correct Answer: B — 4
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Q. Find the particular solution of dy/dx = 4y with the initial condition y(0) = 2.
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A.
y = 2e^(4x)
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B.
y = e^(4x)
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C.
y = 4e^(x)
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D.
y = 2e^(x)
Solution
The general solution is y = Ce^(4x). Using the initial condition y(0) = 2, we find C = 2, thus y = 2e^(4x).
Correct Answer: A — y = 2e^(4x)
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Q. Find the particular solution of dy/dx = 4y, given y(0) = 2.
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A.
y = 2e^(4x)
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B.
y = e^(4x)
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C.
y = 4e^(2x)
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D.
y = 2e^(x/4)
Solution
The general solution is y = Ce^(4x). Using the initial condition y(0) = 2, we find C = 2, thus y = 2e^(4x).
Correct Answer: A — y = 2e^(4x)
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Q. Find the point of inflection for f(x) = x^3 - 6x^2 + 9x. (2022)
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A.
(1, 4)
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B.
(2, 3)
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C.
(3, 0)
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D.
(0, 0)
Solution
f''(x) = 6x - 12. Setting f''(x) = 0 gives x = 2. f(2) = 3.
Correct Answer: C — (3, 0)
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Q. Find the point on the curve y = x^3 - 3x^2 + 4 that has a horizontal tangent. (2023)
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A.
(0, 4)
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B.
(1, 2)
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C.
(2, 2)
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D.
(3, 4)
Solution
To find horizontal tangents, set the derivative y' = 3x^2 - 6x = 0. This gives x = 0 and x = 2. The point (1, 2) has a horizontal tangent.
Correct Answer: B — (1, 2)
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Q. Find the real part of the complex number 4 + 5i. (2023)
Solution
The real part of the complex number 4 + 5i is 4.
Correct Answer: A — 4
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Q. Find the roots of the equation x² + 2x - 8 = 0. (2022)
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A.
-4 and 2
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B.
4 and -2
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C.
2 and -4
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D.
0 and 8
Solution
Factoring gives (x + 4)(x - 2) = 0, hence the roots are 4 and -2.
Correct Answer: B — 4 and -2
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Q. Find the slope of the tangent line to f(x) = 2x^3 - 3x^2 + 4 at x = 1. (2021)
Solution
f'(x) = 6x^2 - 6. f'(1) = 6(1)^2 - 6 = 0.
Correct Answer: B — 2
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Q. Find the solution of the differential equation dy/dx = y^2.
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A.
y = 1/(C - x)
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B.
y = C/(x - 1)
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C.
y = Cx
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D.
y = e^(x)
Solution
This is a separable equation. Integrating gives y = 1/(C - x).
Correct Answer: A — y = 1/(C - x)
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Q. Find the solution of the differential equation y' = 3y + 6.
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A.
y = Ce^(3x) - 2
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B.
y = Ce^(3x) + 2
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C.
y = 2e^(3x)
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D.
y = 3Ce^(x)
Solution
This is a linear first-order equation. The integrating factor is e^(3x). The solution is y = Ce^(3x) + 2.
Correct Answer: B — y = Ce^(3x) + 2
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Q. Find the solution of the equation dy/dx = y^2 - 1.
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A.
y = tan(x + C)
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B.
y = C/(1 - Cx)
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C.
y = 1/(C - x)
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D.
y = C/(x + 1)
Solution
This is a separable equation. The solution is y = tan(x + C).
Correct Answer: A — y = tan(x + C)
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Q. Find the solution of the equation y' + 2y = 0.
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A.
y = Ce^(-2x)
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B.
y = Ce^(2x)
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C.
y = 2Ce^x
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D.
y = Ce^x
Solution
This is a first-order linear differential equation. The solution is y = Ce^(-2x).
Correct Answer: A — y = Ce^(-2x)
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Q. Find the term containing x^3 in the expansion of (x - 1)^5.
Solution
The term containing x^3 is C(5,3) * x^3 * (-1)^2 = 10 * x^3 * 1 = 10.
Correct Answer: C — -10
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Q. Find the term independent of x in the expansion of (x^2 - 2x + 3)^4. (2022)
Solution
The term independent of x occurs when the powers of x cancel out. The term is 81.
Correct Answer: A — 81
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Q. Find the term independent of x in the expansion of (x^2 - 3x + 1)^5. (2023)
Solution
The term independent of x occurs when the powers of x cancel out. The term is C(5,2)(-3)^2(1)^3 = 45.
Correct Answer: A — -15
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Q. Find the term independent of x in the expansion of (x^2 - 4x + 4)^4. (2020)
Solution
The expression can be rewritten as (x - 2)^4. The term independent of x occurs when k = 4, which gives us (-2)^4 = 16.
Correct Answer: C — 256
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Q. Find the value of (3 + 2)^3 using the binomial theorem.
Solution
Using the binomial theorem, (3 + 2)^3 = C(3,0) * 3^3 * 2^0 + C(3,1) * 3^2 * 2^1 + C(3,2) * 3^1 * 2^2 + C(3,3) * 3^0 * 2^3 = 27 + 54 + 36 + 8 = 125.
Correct Answer: B — 27
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Q. Find the value of k for which the equation x² + 4x + k = 0 has no real roots. (2020)
Solution
The discriminant must be negative: 4² - 4*1*k < 0, which gives k > 4, so the minimum value is -6.
Correct Answer: B — -6
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Q. Find the value of k for which the equation x² + kx + 16 = 0 has equal roots. (2022)
Solution
For equal roots, the discriminant must be zero: k² - 4*1*16 = 0, thus k² = 64, k = ±8. The value of k can be -8.
Correct Answer: A — -8
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Q. Find the value of k if the equation x² + kx + 16 = 0 has no real roots. (2022)
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A.
k < 8
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B.
k > 8
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C.
k < 0
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D.
k > 0
Solution
For no real roots, the discriminant must be less than zero: k² - 4*1*16 < 0, which gives k > 8.
Correct Answer: B — k > 8
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Q. Find the x-intercept of the line 5x - 2y + 10 = 0.
Solution
Setting y = 0 in the equation gives 5x + 10 = 0, thus x = -2. The x-intercept is -2.
Correct Answer: B — 2
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Q. Find the y-intercept of the line 4x + y - 8 = 0.
Solution
Setting x = 0 in the equation gives y = 8. Therefore, the y-intercept is 8.
Correct Answer: A — 8
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Q. Find ∫ (5x^4) dx. (2020)
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A.
x^5 + C
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B.
x^5 + 5C
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C.
x^5 + 1
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D.
5x^5 + C
Solution
The integral is (5/5)x^5 + C = x^5 + C.
Correct Answer: A — x^5 + C
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Q. Find ∫ (6x^2 - 4) dx. (2019)
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A.
2x^3 - 4x + C
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B.
2x^3 - 2x + C
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C.
2x^3 - 4 + C
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D.
3x^3 - 4x + C
Solution
The integral is (6/3)x^3 - 4x + C = 2x^3 - 4x + C.
Correct Answer: A — 2x^3 - 4x + C
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-
A.
e^x + C
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B.
e^x
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C.
x e^x + C
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D.
ln(e^x) + C
Solution
The integral of e^x is e^x + C.
Correct Answer: A — e^x + C
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Q. For the equation x² + 6x + k = 0 to have real roots, what is the minimum value of k? (2021)
Solution
The discriminant must be non-negative: 6² - 4*1*k ≥ 0, which gives k ≤ 9, so the minimum value is -9.
Correct Answer: A — -9
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