Q. If f(x) = x^2 + 3x + 2, what is the limit as x approaches -1?
Solution
lim x→-1 f(x) = (-1)^2 + 3(-1) + 2 = 1 - 3 + 2 = 0.
Correct Answer:
C
— 2
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Q. If f(x) = x^2 + 3x + 2, what is the value of f(-1) and is it continuous?
-
A.
0, Continuous
-
B.
0, Discontinuous
-
C.
4, Continuous
-
D.
4, Discontinuous
Solution
f(-1) = (-1)^2 + 3(-1) + 2 = 0. Since f(x) is a polynomial, it is continuous everywhere.
Correct Answer:
C
— 4, Continuous
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Q. If f(x) = x^2 + 3x + 5, what is f''(x)? (2020)
Solution
The first derivative f'(x) = 2x + 3, and the second derivative f''(x) = 2.
Correct Answer:
A
— 2
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Q. If f(x) = x^2 - 4, what is the continuity of f(x) at x = 2?
-
A.
Continuous
-
B.
Not Continuous
-
C.
Only left continuous
-
D.
Only right continuous
Solution
f(x) = x^2 - 4 is a polynomial function, which is continuous everywhere, including at x = 2.
Correct Answer:
A
— Continuous
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Q. If f(x) = x^2 for x < 1 and f(x) = 2x - 1 for x ≥ 1, is f(x) continuous at x = 1? (2019)
-
A.
Yes
-
B.
No
-
C.
Only left continuous
-
D.
Only right continuous
Solution
At x = 1, f(1) = 1^2 = 1 and the limit from the left is also 1, hence f(x) is continuous at x = 1.
Correct Answer:
A
— Yes
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Q. If f(x) = x^2 for x < 1 and f(x) = 3 for x ≥ 1, is f(x) continuous at x = 1?
-
A.
Yes
-
B.
No
-
C.
Only left continuous
-
D.
Only right continuous
Solution
At x = 1, f(1) = 3 and limit from left is 1^2 = 1. Since they are not equal, f(x) is discontinuous at x = 1.
Correct Answer:
B
— No
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Q. If f(x) = x^3 - 3x + 2, what is f(1)? Is f(x) continuous at x = 1? (2019)
-
A.
0, Yes
-
B.
0, No
-
C.
1, Yes
-
D.
1, No
Solution
f(1) = 1^3 - 3*1 + 2 = 0. The function is a polynomial and hence continuous everywhere, including at x = 1.
Correct Answer:
C
— 1, Yes
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Q. If f(x) = x^3 - 3x + 2, what is the value of f(1) and is it continuous?
-
A.
0, Continuous
-
B.
0, Not Continuous
-
C.
1, Continuous
-
D.
1, Not Continuous
Solution
f(1) = 1^3 - 3(1) + 2 = 0. Since f(x) is a polynomial, it is continuous everywhere.
Correct Answer:
A
— 0, Continuous
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Q. If f(x) = x^3 - 3x^2 + 4, what is f'(2)? (2020)
Solution
First, find f'(x) = 3x^2 - 6x. Then, f'(2) = 3(2^2) - 6(2) = 12 - 12 = 0.
Correct Answer:
A
— 0
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Q. If f(x) = x^3 - 4x + 1, what is f''(x)? (2023)
-
A.
6x - 4
-
B.
6x + 4
-
C.
3x^2 - 4
-
D.
3x^2 + 4
Solution
First derivative f'(x) = 3x^2 - 4, then f''(x) = 6x.
Correct Answer:
A
— 6x - 4
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Q. If f(x) = x^3 - 6x^2 + 9x, find the inflection point. (2023)
-
A.
(1, 4)
-
B.
(2, 0)
-
C.
(3, 0)
-
D.
(0, 0)
Solution
Find f''(x) = 6x - 12. Set f''(x) = 0 gives x = 2. The inflection point is (2, f(2)) = (2, 0).
Correct Answer:
B
— (2, 0)
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Q. If f(x) = x^4 - 2x^3 + x, what is f'(1)? (2023)
Solution
First, find f'(x) = 4x^3 - 6x^2 + 1. Then, f'(1) = 4(1)^3 - 6(1)^2 + 1 = 4 - 6 + 1 = -1.
Correct Answer:
A
— 2
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Q. If f(x) = x^4 - 4x^3 + 6x^2, what is f'(2)? (2019)
Solution
f'(x) = 4x^3 - 12x^2 + 12x; f'(2) = 4(2^3) - 12(2^2) + 12(2) = 32 - 48 + 24 = 8.
Correct Answer:
B
— 4
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Q. If f(x) = x^4 - 4x^3, find f'(2). (2023)
Solution
f'(x) = 4x^3 - 12x^2; thus, f'(2) = 4(2^3) - 12(2^2) = 32 - 48 = -16.
Correct Answer:
C
— 16
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Q. If f(x) = x^4 - 4x^3, what is f'(2)? (2019)
Solution
f'(x) = 4x^3 - 12x^2. f'(2) = 4(2^3) - 12(2^2) = 32 - 48 = -16.
Correct Answer:
B
— 8
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Q. If f(x) = x^4 - 8x^2 + 16, what is the minimum value of f(x)? (2023)
Solution
Finding the derivative f'(x) = 4x^3 - 16x. Setting it to zero gives x = 0, ±2. The minimum value occurs at x = 2, f(2) = 0.
Correct Answer:
A
— 0
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Q. If G = [[2, 3], [5, 7]], find the eigenvalues of G.
-
A.
1, 8
-
B.
2, 7
-
C.
3, 5
-
D.
4, 6
Solution
The eigenvalues are found by solving the characteristic equation det(G - λI) = 0. The eigenvalues are λ = 1, 8.
Correct Answer:
A
— 1, 8
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Q. If H = [[0, 1], [-1, 0]], what is the determinant of H? (2019)
Solution
The determinant of H is calculated as (0*-0) - (1*-1) = 0 + 1 = 1.
Correct Answer:
C
— -1
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Q. If H = [[1, 2, 3], [0, 1, 4], [5, 6, 0]], find the determinant of H. (2022)
Solution
Using the determinant formula for 3x3 matrices, det(H) = 1(1*0 - 4*6) - 2(0 - 4*5) + 3(0 - 1*5) = 0 - 40 - 15 = -55.
Correct Answer:
A
— -24
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Q. If H = [[1, 2], [2, 4]], what is the rank of H?
Solution
The rank of H is 1 because the second row is a multiple of the first row.
Correct Answer:
A
— 1
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Q. If H = [[2, 3], [5, 7]], find the eigenvalues of H. (2023)
-
A.
1, 8
-
B.
2, 7
-
C.
3, 5
-
D.
4, 5
Solution
The eigenvalues are found by solving the characteristic equation: det(H - λI) = 0, which gives λ^2 - 9λ + 1 = 0.
Correct Answer:
A
— 1, 8
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Q. If h(x) = e^(2x), what is h'(x)? (2019)
-
A.
2e^(2x)
-
B.
e^(2x)
-
C.
2xe^(2x)
-
D.
e^(x)
Solution
Using the chain rule, h'(x) = 2e^(2x).
Correct Answer:
A
— 2e^(2x)
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Q. If I = [[1, 1], [1, 1]], what is the rank of I? (2022)
Solution
The rank of I is 1 because all rows are linearly dependent.
Correct Answer:
B
— 1
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Q. If I = [[1, 2, 3], [0, 1, 4], [5, 6, 0]], find the determinant of I.
Solution
Using the determinant formula for 3x3 matrices, det(I) = 1(1*0 - 4*6) - 2(0 - 4*5) + 3(0 - 1*5) = 0 - 40 - 15 = -55.
Correct Answer:
A
— -24
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Q. If I = [[2, 1], [1, 2]], what is the trace of I?
Solution
The trace of a matrix is the sum of its diagonal elements. Thus, trace(I) = 2 + 2 = 4.
Correct Answer:
C
— 3
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Q. If J = [[1, 1], [1, 1]], what is the rank of J?
Solution
The rank of J is 1 because both rows are linearly dependent (they are identical).
Correct Answer:
B
— 1
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Q. If J = [[1, 2, 3], [4, 5, 6], [7, 8, 9]], what is det(J)?
Solution
The determinant of J is 0, as the rows are linearly dependent.
Correct Answer:
A
— 0
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Q. If log_10(0.01) = x, what is the value of x?
Solution
log_10(0.01) = log_10(10^-2) = -2, so x = -2.
Correct Answer:
B
— -2
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Q. If log_10(10^x) = 2, what is the value of x? (2023)
Solution
log_10(10^x) = x. Therefore, x = 2.
Correct Answer:
B
— 2
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Q. If log_10(2) = 0.301, what is log_10(20)? (2023)
-
A.
0.301
-
B.
0.699
-
C.
1.301
-
D.
1.699
Solution
log_10(20) = log_10(2) + log_10(10) = 0.301 + 1 = 1.301.
Correct Answer:
C
— 1.301
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