Q. For the function f(x) = -x^2 + 4x + 1, find the maximum value. (2023)
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Solution
The maximum occurs at x = -b/(2a) = -4/(-2) = 2. f(2) = -2^2 + 4(2) + 1 = 5.
Correct Answer:
B
— 5
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Q. For the function f(x) = 3x^2 - 12x + 7, find the coordinates of the minimum point. (2019)
A.
(2, -5)
B.
(2, -1)
C.
(4, 1)
D.
(4, -5)
Show solution
Solution
The vertex is at x = -(-12)/(2*3) = 2. The minimum value is f(2) = 3(2^2) - 12(2) + 7 = -5. Thus, the coordinates are (2, -5).
Correct Answer:
A
— (2, -5)
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Q. For the function f(x) = e^x, what is f''(x)? (2021)
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Solution
The second derivative f''(x) = d/dx(e^x) = e^x.
Correct Answer:
A
— e^x
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Q. For the function f(x) = sin(x) + cos(x), what is f'(π/4)? (2023)
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Solution
f'(x) = cos(x) - sin(x). At x = π/4, f'(π/4) = cos(π/4) - sin(π/4) = √2/2 - √2/2 = 0.
Correct Answer:
B
— √2
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Q. For the function f(x) = sin(x), what is f'(π/2)? (2021)
A.
0
B.
1
C.
-1
D.
undefined
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Solution
f'(x) = cos(x); f'(π/2) = cos(π/2) = 0.
Correct Answer:
B
— 1
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Q. For the function f(x) = x^2 - 6x + 10, what is the minimum value? (2020)
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Solution
The vertex is at x = 6/2 = 3. The minimum value is f(3) = 3^2 - 6*3 + 10 = 1.
Correct Answer:
B
— 3
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Q. For the function f(x) = x^3 - 3x + 2, find the points of discontinuity.
A.
None
B.
x = 1
C.
x = -1
D.
x = 2
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Solution
f(x) is a polynomial function and is continuous everywhere, hence no points of discontinuity.
Correct Answer:
A
— None
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Q. For the function f(x) = { 2x + 1, x < 1; 3, x = 1; x^2, x > 1 }, is f(x) continuous at x = 1?
A.
Yes
B.
No
C.
Only left continuous
D.
Only right continuous
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Solution
The left limit as x approaches 1 is 3, the right limit is 1, and f(1) = 3. Since the limits do not match, f(x) is discontinuous at x = 1.
Correct Answer:
B
— No
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Q. For the function f(x) = { x^2, x < 0; 0, x = 0; x + 1, x > 0 }, is f(x) continuous at x = 0?
A.
Yes
B.
No
C.
Only left continuous
D.
Only right continuous
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Solution
The left limit as x approaches 0 is 0, the right limit is 1, and f(0) = 0. Since the limits do not match, f(x) is discontinuous at x = 0.
Correct Answer:
B
— No
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Q. For the function f(x) = { x^2, x < 2; 4, x = 2; 2x, x > 2 }, is f(x) continuous at x = 2?
A.
Yes
B.
No
C.
Only left continuous
D.
Only right continuous
Show solution
Solution
At x = 2, left limit is 4 and right limit is 4, but f(2) = 4. Hence, f(x) is continuous at x = 2.
Correct Answer:
B
— No
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Q. For the function f(x) = { x^2, x < 3; 9, x = 3; x + 3, x > 3 }, is f(x) continuous at x = 3?
A.
Yes
B.
No
C.
Only left continuous
D.
Only right continuous
Show solution
Solution
The left limit as x approaches 3 is 9, the right limit is also 9, and f(3) = 9. Therefore, f(x) is continuous at x = 3.
Correct Answer:
A
— Yes
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Q. For the matrix D = [[4, 2], [1, 3]], find the inverse of D. (2022)
A.
[[3, -2], [-1, 4]]
B.
[[3, 2], [-1, 4]]
C.
[[3, -2], [1, 4]]
D.
[[4, -2], [-1, 3]]
Show solution
Solution
The inverse of D is given by (1/det(D)) * adj(D). Here, det(D) = (4*3) - (2*1) = 10. The adjugate is [[3, -2], [-1, 4]]. Thus, D^(-1) = (1/10) * [[3, -2], [-1, 4]].
Correct Answer:
A
— [[3, -2], [-1, 4]]
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Q. For the matrix J = [[0, 1], [1, 0]], what is J^2?
A.
[[1, 0], [0, 1]]
B.
[[0, 1], [1, 0]]
C.
[[0, 0], [0, 0]]
D.
[[1, 1], [1, 1]]
Show solution
Solution
Calculating J^2 gives [[0, 1], [1, 0]] * [[0, 1], [1, 0]] = [[1, 0], [0, 1]], which is the identity matrix.
Correct Answer:
A
— [[1, 0], [0, 1]]
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Q. For the matrix J = [[1, 2, 3], [0, 1, 4], [5, 6, 0]], find the determinant. (2023)
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Solution
Using the determinant formula, det(J) = 1*(1*0 - 4*6) - 2*(0*0 - 4*5) + 3*(0*6 - 1*5) = 1*(-24) - 2*(-20) + 3*(-5) = -24 + 40 - 15 = 1.
Correct Answer:
A
— -24
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Q. For the matrix \( F = \begin{pmatrix} 2 & 1 \\ 3 & 4 \end{pmatrix} \), what is the value of the determinant? (2021)
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Solution
Det(F) = (2*4) - (1*3) = 8 - 3 = 5.
Correct Answer:
A
— 5
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Q. For the parabola defined by the equation x^2 = -12y, what is the direction in which it opens?
A.
Upwards
B.
Downwards
C.
Left
D.
Right
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Solution
The equation x^2 = -12y indicates that the parabola opens downwards.
Correct Answer:
C
— Left
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Q. For the parabola defined by the equation x^2 = 16y, what is the distance from the vertex to the focus?
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Solution
In the equation x^2 = 4py, we have 4p = 16, thus p = 4. The distance from the vertex to the focus is 4.
Correct Answer:
B
— 4
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Q. For the parabola defined by the equation x^2 = 16y, what is the length of the latus rectum?
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Solution
The length of the latus rectum for the parabola x^2 = 4py is 4p. Here, p = 4, so the length is 8.
Correct Answer:
B
— 8
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Q. For the parabola defined by the equation y = -x^2 + 4x - 3, what is the y-intercept?
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Solution
To find the y-intercept, set x = 0. The equation becomes y = -0^2 + 4(0) - 3 = -3.
Correct Answer:
A
— -3
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Q. For the polynomial x^3 - 3x^2 + 3x - 1, what is the nature of its roots? (2020)
A.
All real and distinct
B.
All real and equal
C.
One real and two complex
D.
All complex
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Solution
The polynomial can be factored as (x-1)^3, indicating that it has one real root with multiplicity 3, hence all roots are real and equal.
Correct Answer:
B
— All real and equal
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Q. For the polynomial x^3 - 3x^2 + 3x - 1, what is the value of the sum of the roots? (2019)
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Solution
The sum of the roots is given by -b/a = 3/1 = 3.
Correct Answer:
B
— 3
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Q. For the polynomial x^3 - 3x^2 + 3x - 1, which of the following is true about its roots?
A.
All roots are real
B.
All roots are complex
C.
One root is real
D.
Two roots are real
Show solution
Solution
The polynomial can be factored as (x - 1)^3, indicating that all roots are real and equal.
Correct Answer:
A
— All roots are real
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Q. For the quadratic equation 2x^2 + 4x + 2 = 0, what is the value of the discriminant? (2020)
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Solution
The discriminant D = b^2 - 4ac = 4^2 - 4(2)(2) = 16 - 16 = 0.
Correct Answer:
A
— 0
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Q. For the quadratic equation 2x^2 + 4x + k = 0 to have equal roots, what should be the value of k? (2020)
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Solution
For equal roots, the discriminant must be zero: b^2 - 4ac = 0. Here, 4^2 - 4(2)(k) = 0 leads to k = 4.
Correct Answer:
A
— -4
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Q. For the quadratic equation 2x^2 + 4x + k = 0 to have real and equal roots, what is the condition on k? (2020)
A.
k < 0
B.
k = 0
C.
k = 8
D.
k > 8
Show solution
Solution
For real and equal roots, the discriminant must be zero. Here, b^2 - 4ac = 0 gives 16 - 8k = 0, thus k = 8.
Correct Answer:
C
— k = 8
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Q. For the quadratic equation 2x^2 + 4x + k = 0 to have real roots, what must be the condition on k? (2019)
A.
k > 4
B.
k < 4
C.
k >= 4
D.
k <= 4
Show solution
Solution
The discriminant must be non-negative: 4^2 - 4*2*k >= 0, which simplifies to k <= 4.
Correct Answer:
D
— k <= 4
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Q. For the quadratic equation 2x^2 + 4x - 6 = 0, what is the value of the discriminant? (2020)
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Solution
The discriminant D = b^2 - 4ac = 4^2 - 4(2)(-6) = 16 + 48 = 64.
Correct Answer:
A
— 16
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Q. For the quadratic equation 2x^2 - 4x + k = 0 to have equal roots, what must be the value of k? (2019)
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Solution
For equal roots, the discriminant must be zero: (-4)^2 - 4*2*k = 0. Solving gives k = 4.
Correct Answer:
C
— 4
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Q. For the quadratic equation 5x^2 + 3x - 2 = 0, what is the value of the roots using the quadratic formula? (2023)
A.
-1, 2/5
B.
1, -2/5
C.
2, -1/5
D.
0, -2
Show solution
Solution
Using the quadratic formula x = [-b ± √(b^2 - 4ac)] / 2a, we find the roots to be -1 and 2/5.
Correct Answer:
A
— -1, 2/5
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Q. For the quadratic equation x^2 + 2px + p^2 - 4 = 0, what condition must p satisfy for the roots to be real? (2023)
A.
p > 2
B.
p < 2
C.
p = 2
D.
p >= 2
Show solution
Solution
The discriminant must be non-negative: (2p)^2 - 4(1)(p^2 - 4) >= 0 leads to p >= 2.
Correct Answer:
D
— p >= 2
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