Q. If F = [[2, 0], [0, 3]], what is det(F)? (2020)
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Solution
The determinant of F is calculated as (2*3) - (0*0) = 6.
Correct Answer:
B
— 6
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Q. If F = [[2, 1, 3], [1, 0, 2], [0, 1, 1]], what is det(F)? (2023)
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Solution
Det(F) = 2(0*1 - 2*1) - 1(1*1 - 2*0) + 3(1*1 - 0*0) = 2(0 - 2) - 1(1) + 3(1) = -4 - 1 + 3 = -2.
Correct Answer:
C
— 3
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Q. If F = [[2, 1, 3], [1, 0, 2], [3, 1, 1]], find det(F). (2022)
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Solution
Using the determinant formula, det(F) = 2(0*1 - 2*1) - 1(1*1 - 2*3) + 3(1*1 - 0*3) = 2(0 - 2) - 1(1 - 6) + 3(1 - 0) = -4 + 5 + 3 = 4.
Correct Answer:
A
— -4
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Q. If F = [[2, 1, 3], [1, 0, 2], [3, 4, 1]], find det(F). (2022)
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Solution
Using the determinant formula, det(F) = 2*(0*1 - 2*4) - 1*(1*1 - 2*3) + 3*(1*4 - 0*3) = 2*(-8) - 1*(-5) + 3*4 = -16 + 5 + 12 = 1.
Correct Answer:
A
— -10
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Q. If F = [[2, 1], [1, 3]], what is the value of det(F)? (2022)
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Solution
The determinant of F is (2*3) - (1*1) = 6 - 1 = 5.
Correct Answer:
A
— 5
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Q. If F = {1, 2, 3, 4}, how many subsets of F contain the element 1?
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Solution
If 1 is included, we can choose from the remaining elements {2, 3, 4}, which has 2^3 = 8 subsets.
Correct Answer:
C
— 6
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Q. If F = {1, 2, 3, 4}, what is the number of proper subsets of F?
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Solution
The total number of subsets of a set with n elements is 2^n. For F, n = 4, so there are 2^4 = 16 subsets. Proper subsets are total subsets minus the set itself, so 16 - 1 = 15.
Correct Answer:
B
— 8
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Q. If F = {1, 2, 3}, what is the number of elements in the power set of F?
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Solution
The power set of a set with n elements has 2^n elements. For F, n = 3, so the power set has 2^3 = 8 elements.
Correct Answer:
D
— 8
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Q. If F = {a, b, c}, how many subsets contain exactly 2 elements?
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Solution
The subsets containing exactly 2 elements are {a, b}, {a, c}, and {b, c}. So, there are 3 such subsets.
Correct Answer:
A
— 3
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Q. If F = {x | x is an even number between 1 and 10}, what is F?
A.
{2, 4, 6, 8}
B.
{1, 3, 5, 7, 9}
C.
{2, 4, 6, 8, 10}
D.
{0, 2, 4, 6, 8}
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Solution
The even numbers between 1 and 10 are 2, 4, 6, and 8. Therefore, F = {2, 4, 6, 8}.
Correct Answer:
A
— {2, 4, 6, 8}
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Q. If F = {x, y, z}, what is the size of the power set of F?
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Solution
The size of the power set is 2^n where n is the number of elements in the set. Here, n = 3, so the size is 2^3 = 8.
Correct Answer:
C
— 8
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Q. If F = {x, y}, how many subsets of F are there that do not contain 'y'?
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Solution
The subsets of F that do not contain 'y' are {∅, {x}}, totaling 2 subsets.
Correct Answer:
A
— 1
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Q. If F is to the left of G and H is to the right of F, which of the following must be true?
A.
G is to the right of H
B.
F is to the left of H
C.
H is to the left of G
D.
G is to the left of F
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Solution
Since F is to the left of G and H is to the right of F, it follows that F must be to the left of H.
Correct Answer:
B
— F is to the left of H
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Q. If f(x) = 1/(x-1), what is the point of discontinuity?
A.
x = 0
B.
x = 1
C.
x = -1
D.
x = 2
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Solution
The function is discontinuous at x = 1 because it leads to division by zero.
Correct Answer:
B
— x = 1
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Q. If f(x) = 2x + 3, what is f(4)?
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Solution
Substituting x = 4 into the function gives f(4) = 2(4) + 3 = 8 + 3 = 11.
Correct Answer:
B
— 11
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Q. If f(x) = 2x + 3, what is f(5)?
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Solution
f(5) = 2(5) + 3 = 10 + 3 = 13.
Correct Answer:
B
— 13
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Q. If f(x) = 2x^2 + 3x - 5, what is f(-1)?
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Solution
f(-1) = 2(-1)^2 + 3(-1) - 5 = 2 - 3 - 5 = -6.
Correct Answer:
B
— -2
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Q. If f(x) = 2x^2 - 3x + 1, what is f(2)?
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Solution
f(2) = 2(2^2) - 3(2) + 1 = 8 - 6 + 1 = 3.
Correct Answer:
C
— 5
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Q. If f(x) = 2x^3 - 9x^2 + 12x, find the intervals where f(x) is increasing.
A.
(-∞, 1)
B.
(1, 3)
C.
(3, ∞)
D.
(0, 2)
Show solution
Solution
Find f'(x) = 6x^2 - 18x + 12. Setting f'(x) = 0 gives x = 1 and x = 2. Testing intervals, f(x) is increasing on (1, 3).
Correct Answer:
B
— (1, 3)
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Q. If f(x) = 2^x, what is f(3)?
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Q. If f(x) = 3x + 2, what is the value of f(1) and is it continuous?
A.
5, Continuous
B.
5, Not Continuous
C.
3, Continuous
D.
3, Not Continuous
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Solution
f(1) = 3(1) + 2 = 5. Since f(x) is a linear function, it is continuous everywhere.
Correct Answer:
A
— 5, Continuous
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Q. If f(x) = 3x + 2, what is the value of f(2) and is it continuous?
A.
8, Continuous
B.
8, Discontinuous
C.
7, Continuous
D.
7, Discontinuous
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Solution
f(2) = 3(2) + 2 = 8. Since f(x) is a polynomial, it is continuous everywhere.
Correct Answer:
A
— 8, Continuous
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Q. If f(x) = 3x - 4, find f(-2).
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Solution
f(-2) = 3(-2) - 4 = -6 - 4 = -10.
Correct Answer:
A
— -10
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Q. If f(x) = 3x - 4, what is f(-2)?
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Solution
f(-2) = 3(-2) - 4 = -6 - 4 = -10.
Correct Answer:
A
— -10
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Q. If f(x) = 3x - 4, what is the inverse function f^(-1)(x)?
A.
(x + 4)/3
B.
3x + 4
C.
3(x - 4)
D.
x/3 + 4
Show solution
Solution
To find the inverse, set y = 3x - 4, solve for x: x = (y + 4)/3, thus f^(-1)(x) = (x + 4)/3.
Correct Answer:
A
— (x + 4)/3
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Q. If f(x) = 3x - 5, what is f(f(1))?
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Solution
First, find f(1) = 3(1) - 5 = -2. Then, f(-2) = 3(-2) - 5 = -6 - 5 = -11.
Correct Answer:
D
— 7
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Q. If f(x) = 3x^2 + 2x - 5, what is f(1)?
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Solution
Substituting x = 1 into the function gives f(1) = 3(1)^2 + 2(1) - 5 = 3 + 2 - 5 = 0.
Correct Answer:
B
— 1
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Q. If f(x) = 3x^2 + 2x, what is f'(2)? (2023)
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Solution
First, find f'(x) = 6x + 2. Then, f'(2) = 6(2) + 2 = 12 + 2 = 14.
Correct Answer:
A
— 10
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Q. If f(x) = 4x^3 - 2x^2 + x, what is f''(x)?
A.
24x - 4
B.
12x - 2
C.
12x - 4
D.
24x - 2
Show solution
Solution
First, find f'(x) = 12x^2 - 4x + 1, then differentiate again to get f''(x) = 24x - 4.
Correct Answer:
A
— 24x - 4
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Q. If f(x) = 5x^2 + 3x - 1, what is f''(x)? (2020)
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Solution
The first derivative f'(x) = 10x + 3, and the second derivative f''(x) = 10.
Correct Answer:
A
— 10
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