Q. If f(x) = 5x^2 + 3x - 1, what is f'(2)? (2020)
Solution
First, find f'(x) = 10x + 3. Then, f'(2) = 10(2) + 3 = 20 + 3 = 23.
Correct Answer:
A
— 27
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Q. If f(x) = 5x^2 - 3x + 7, what is f''(x)? (2020)
Solution
The first derivative f'(x) = 10x - 3, and the second derivative f''(x) = 10.
Correct Answer:
A
— 10
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Q. If f(x) = e^x + x^2, what is f'(0)? (2021)
Solution
f'(x) = e^x + 2x. Thus, f'(0) = e^0 + 2(0) = 1 + 0 = 1.
Correct Answer:
A
— 1
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Q. If f(x) = e^x, what is f''(x)? (2020)
-
A.
e^x
-
B.
xe^x
-
C.
2e^x
-
D.
0
Solution
The second derivative f''(x) = d^2/dx^2(e^x) = e^x.
Correct Answer:
A
— e^x
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Q. If f(x) = e^x, what is the value of f''(0)? (2021)
Solution
f'(x) = e^x and f''(x) = e^x. Therefore, f''(0) = e^0 = 1.
Correct Answer:
A
— 1
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Q. If f(x) = ln(x), what is f'(1)? (2020)
-
A.
1
-
B.
0
-
C.
undefined
-
D.
ln(1)
Solution
f'(x) = 1/x. Therefore, f'(1) = 1/1 = 1.
Correct Answer:
A
— 1
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Q. If f(x) = ln(x), what is f'(e)?
Solution
f'(x) = 1/x. Therefore, f'(e) = 1/e.
Correct Answer:
A
— 1
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Q. If f(x) = ln(x^2 + 1), find f'(1). (2022)
Solution
f'(x) = (2x)/(x^2 + 1). At x = 1, f'(1) = (2*1)/(1^2 + 1) = 1.
Correct Answer:
B
— 1
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Q. If f(x) = ln(x^2 + 1), what is f'(x)?
-
A.
2x/(x^2 + 1)
-
B.
1/(x^2 + 1)
-
C.
2/(x^2 + 1)
-
D.
x/(x^2 + 1)
Solution
Using the chain rule, f'(x) = (1/(x^2 + 1)) * (2x) = 2x/(x^2 + 1).
Correct Answer:
A
— 2x/(x^2 + 1)
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Q. If f(x) = sin(x) + cos(x), what is f'(x)?
-
A.
cos(x) - sin(x)
-
B.
-sin(x) + cos(x)
-
C.
sin(x) + cos(x)
-
D.
-cos(x) - sin(x)
Solution
Using the derivative rules, f'(x) = cos(x) - sin(x).
Correct Answer:
B
— -sin(x) + cos(x)
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Q. If f(x) = sin(x) + cos(x), what is f'(π/4)?
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:
C
— 1
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Q. If f(x) = x^2 * e^x, find f'(x). (2019)
-
A.
e^x(x^2 + 2x)
-
B.
e^x(x^2 - 2x)
-
C.
x^2 * e^x
-
D.
2x * e^x
Solution
Using the product rule, f'(x) = e^x(x^2 + 2x).
Correct Answer:
A
— e^x(x^2 + 2x)
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Q. If f(x) = x^2 * e^x, what is f'(x)? (2019)
-
A.
e^x(x^2 + 2x)
-
B.
e^x(x^2 - 2x)
-
C.
2xe^x
-
D.
x^2e^x
Solution
Using the product rule, f'(x) = e^x(x^2 + 2x).
Correct Answer:
A
— e^x(x^2 + 2x)
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Q. If f(x) = x^2 * ln(x), what is f'(x)? (2022)
-
A.
2x * ln(x) + x
-
B.
x * ln(x) + 2x
-
C.
2x * ln(x) - x
-
D.
x * ln(x) - 2x
Solution
Using the product rule, f'(x) = 2x * ln(x) + x.
Correct Answer:
A
— 2x * ln(x) + x
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Q. If f(x) = x^2 + 2x + 1, what is f''(x)? (2023)
Solution
First derivative f'(x) = 2x + 2. Second derivative f''(x) = 2.
Correct Answer:
A
— 2
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Q. If f(x) = x^2 + 2x + 1, 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)^2 + 2*(-1) + 1 = 0. The function is a polynomial and is continuous everywhere, including at x = -1.
Correct Answer:
C
— 1, Yes
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Q. If f(x) = x^2 + 3x + 2, what is f(1) and is it continuous?
-
A.
6, Continuous
-
B.
6, Discontinuous
-
C.
5, Continuous
-
D.
5, Discontinuous
Solution
f(1) = 1^2 + 3(1) + 2 = 6. Since f(x) is a polynomial function, it is continuous everywhere.
Correct Answer:
A
— 6, Continuous
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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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