Q. What is the axis of symmetry for the parabola given by the equation y = 3x^2 + 6x + 2?
A.
x = -1
B.
y = -1
C.
x = 1
D.
y = 1
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Solution
The axis of symmetry for a parabola in the form y = ax^2 + bx + c is given by x = -b/(2a). Here, a = 3 and b = 6, so x = -6/(2*3) = -1.
Correct Answer: A — x = -1
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Q. What is the characteristic polynomial of the matrix A = [[1, 2], [3, 4]]?
A.
λ^2 - 5λ - 2
B.
λ^2 - 5λ + 2
C.
λ^2 + 5λ + 2
D.
λ^2 + 5λ - 2
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Solution
The characteristic polynomial is det(A - λI) = det([[1-λ, 2], [3, 4-λ]]) = (1-λ)(4-λ) - 6 = λ^2 - 5λ + 2.
Correct Answer: B — λ^2 - 5λ + 2
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Q. What is the characteristic polynomial of the matrix A = [[2, 1], [1, 2]]?
A.
λ^2 - 3λ + 3
B.
λ^2 - 3λ + 1
C.
λ^2 - 5λ + 2
D.
λ^2 - 2λ + 1
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Solution
The characteristic polynomial is given by det(A - λI) = det([[2-λ, 1], [1, 2-λ]]) = (2-λ)(2-λ) - 1 = λ^2 - 3λ + 3.
Correct Answer: B — λ^2 - 3λ + 1
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Q. What is the circumradius of a triangle with sides 5, 12, and 13?
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Solution
For a right triangle, the circumradius R = hypotenuse/2 = 13/2 = 6.5.
Correct Answer: B — 7
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Q. What is the circumradius of a triangle with sides 6, 8, and 10?
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Solution
Circumradius R = (abc)/(4K), where K is the area. Area K = 24 (using Heron's formula). R = (6*8*10)/(4*24) = 5.
Correct Answer: A — 5
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Q. What is the circumradius of a triangle with sides 7, 24, and 25?
A.
12.5
B.
13
C.
14
D.
15
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Solution
The circumradius R of a triangle can be calculated using the formula R = (abc)/(4 * Area). Here, Area = 84 cm², so R = (7 * 24 * 25)/(4 * 84) = 13.
Correct Answer: B — 13
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Q. What is the circumradius of an equilateral triangle with side length a?
A.
a/√3
B.
a/2
C.
a/√2
D.
a/√3
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Solution
The circumradius R of an equilateral triangle is given by R = a/(√3).
Correct Answer: D — a/√3
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Q. What is the circumradius R of a triangle with sides a = 7, b = 24, c = 25?
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Solution
R = (abc) / (4 * Area). Area = 84, R = (7 * 24 * 25) / (4 * 84) = 12.
Correct Answer: A — 12
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Q. What is the circumradius R of a triangle with sides a, b, c?
A.
abc/4A
B.
A/(abc)
C.
2A/(a+b+c)
D.
a+b+c/2
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Solution
The circumradius R of a triangle is given by the formula R = abc/(4A), where A is the area of the triangle.
Correct Answer: A — abc/4A
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Q. What is the coefficient of variation if the mean is 50 and the standard deviation is 5?
A.
5%
B.
10%
C.
15%
D.
20%
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Solution
Coefficient of Variation = (Standard Deviation / Mean) * 100 = (5 / 50) * 100 = 10%.
Correct Answer: B — 10%
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Q. What is the coefficient of variation if the mean is 50 and the standard deviation is 10?
A.
20%
B.
10%
C.
15%
D.
25%
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Solution
Coefficient of variation = (Standard deviation / Mean) * 100 = (10 / 50) * 100 = 20%.
Correct Answer: A — 20%
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Q. What is the coefficient of x^0 in the expansion of (3x - 4)^5?
A.
-1024
B.
243
C.
-243
D.
1024
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Solution
The coefficient of x^0 is (-4)^5 = -1024.
Correct Answer: A — -1024
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Q. What is the coefficient of x^0 in the expansion of (x + 5)^3?
A.
125
B.
100
C.
75
D.
50
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Solution
The coefficient of x^0 is C(3,0) * 5^3 = 1 * 125 = 125.
Correct Answer: A — 125
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Q. What is the coefficient of x^0 in the expansion of (x + 5)^5?
A.
3125
B.
625
C.
125
D.
25
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Solution
The coefficient of x^0 is C(5,0) * 5^5 = 1 * 3125 = 3125.
Correct Answer: A — 3125
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Q. What is the coefficient of x^2 in the expansion of (3x - 4)^4?
A.
144
B.
216
C.
432
D.
576
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Solution
The coefficient of x^2 is C(4,2) * (3)^2 * (-4)^2 = 6 * 9 * 16 = 864.
Correct Answer: C — 432
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Q. What is the coefficient of x^2 in the expansion of (x - 4)^6?
A.
240
B.
360
C.
480
D.
720
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Solution
Using the binomial theorem, the coefficient of x^2 in (a + b)^n is given by nCk * a^(n-k) * b^k. Here, n=6, a=x, b=-4, and k=2. Thus, the coefficient is 6C2 * (1)^4 * (-4)^2 = 15 * 16 = 240.
Correct Answer: B — 360
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Q. What is the coefficient of x^3 in the expansion of (2x + 3)^5?
A.
90
B.
100
C.
120
D.
150
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Solution
Using the binomial theorem, the coefficient of x^3 is given by C(5,3) * (2)^3 * (3)^(5-3) = 10 * 8 * 9 = 720.
Correct Answer: A — 90
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Q. What is the coefficient of x^4 in the expansion of (2x + 3)^6?
A.
540
B.
720
C.
810
D.
960
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Solution
The coefficient of x^4 is C(6,4) * (2)^4 * (3)^(6-4) = 15 * 16 * 9 = 2160.
Correct Answer: C — 810
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Q. What is the coefficient of x^4 in the expansion of (2x - 3)^5?
A.
240
B.
300
C.
360
D.
420
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Solution
The coefficient of x^4 is C(5, 4) * (2)^4 * (-3)^1 = 5 * 16 * (-3) = -240.
Correct Answer: C — 360
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Q. What is the coefficient of x^4 in the expansion of (x + 1)^6?
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Solution
The coefficient of x^4 is C(6,4) = 15.
Correct Answer: D — 35
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Q. What is the coefficient of x^5 in the expansion of (x + 1/2)^10?
A.
252
B.
210
C.
120
D.
300
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Solution
The coefficient of x^5 is C(10,5) * (1/2)^5 = 252 * 1/32 = 7.875.
Correct Answer: A — 252
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Q. What is the coefficient of x^5 in the expansion of (x + 2)^7?
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Solution
The coefficient of x^5 is C(7,5)(2)^2 = 21 * 4 = 84.
Correct Answer: C — 35
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Q. What is the coefficient of x^5 in the expansion of (x + 2)^8?
A.
672
B.
1280
C.
960
D.
720
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Solution
The coefficient of x^5 is C(8,5) * (2)^3 = 56 * 8 = 448.
Correct Answer: A — 672
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Q. What is the coefficient of x^5 in the expansion of (x + 3)^8?
A.
1680
B.
1440
C.
1260
D.
1080
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Solution
Using the binomial theorem, the coefficient of x^5 in (x + 3)^8 is given by 8C5 * (3)^3 = 56 * 27 = 1512.
Correct Answer: A — 1680
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Q. What is the coefficient of x^6 in the expansion of (x + 5)^8?
A.
6720
B.
5600
C.
4480
D.
3360
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Solution
The coefficient of x^6 is C(8,6) * (5)^2 = 28 * 25 = 700.
Correct Answer: A — 6720
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Q. What is the common ratio of the geometric series 4, 12, 36, ...?
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Solution
The common ratio r = 12/4 = 3.
Correct Answer: A — 3
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Q. What is the composition of functions f(g(x)) if f(x) = x + 1 and g(x) = 2x?
A.
2x + 1
B.
2x - 1
C.
x + 2
D.
x + 1
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Solution
f(g(x)) = f(2x) = 2x + 1.
Correct Answer: A — 2x + 1
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Q. What is the condition for the lines 2x + 3y = 6 and 4x + 6y = 12 to be parallel?
A.
They have the same slope
B.
They intersect
C.
They are identical
D.
None of the above
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Solution
Both lines can be rewritten in slope-intercept form. The first line has slope -2/3 and the second line has the same slope, hence they are parallel.
Correct Answer: A — They have the same slope
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Q. What is the condition for the lines represented by ax^2 + 2hxy + by^2 = 0 to be parallel?
A.
h^2 = ab
B.
h^2 > ab
C.
h^2 < ab
D.
h^2 = 0
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Solution
The condition for the lines to be parallel is given by h^2 = ab.
Correct Answer: A — h^2 = ab
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Q. What is the condition for the lines represented by the equation 2x^2 + 3xy + y^2 = 0 to be coincident?
A.
D = 0
B.
D > 0
C.
D < 0
D.
D = 1
Show solution
Solution
The lines are coincident if the discriminant D of the quadratic equation is zero.
Correct Answer: A — D = 0
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