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, what is f'(1)?
Solution
f'(x) = 10x + 3; f'(1) = 10*1 + 3 = 13.
Correct Answer:
B
— 10
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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^(2x), what is f'(x)?
-
A.
2e^(2x)
-
B.
e^(2x)
-
C.
2x*e^(2x)
-
D.
e^(x)
Solution
Using the chain rule, f'(x) = 2e^(2x).
Correct Answer:
A
— 2e^(2x)
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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 - x^2, find the x-coordinate of the local maximum.
Solution
Find f'(x) = e^x - 2x. Setting f'(x) = 0 gives a local maximum at x = 1.
Correct Answer:
B
— 1
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Q. If f(x) = e^x, then f'(0) is equal to?
Solution
f'(x) = e^x; f'(0) = e^0 = 1.
Correct Answer:
B
— 1
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Q. If f(x) = e^x, what is f''(0)?
Solution
f''(x) = e^x, thus f''(0) = e^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) + x^2, then the function is increasing for:
-
A.
x > 0
-
B.
x < 0
-
C.
x > 1
-
D.
x < 1
Solution
The derivative f'(x) = 1/x + 2x. For f'(x) > 0, we need 1/x + 2x > 0, which holds for x > 0.
Correct Answer:
A
— x > 0
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Q. If f(x) = ln(x) for x > 0, is f differentiable at x = 1?
-
A.
Yes
-
B.
No
-
C.
Only continuous
-
D.
Only left differentiable
Solution
f'(x) = 1/x; f'(1) = 1, hence f is differentiable at x = 1.
Correct Answer:
A
— Yes
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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), what is f'(x)?
-
A.
1/x
-
B.
x
-
C.
ln(x)
-
D.
0
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), then the critical points in the interval [0, 2π] are:
-
A.
π/4, 5π/4
-
B.
π/2, 3π/2
-
C.
0, π
-
D.
π/3, 2π/3
Solution
To find critical points, we set f'(x) = cos(x) - sin(x) = 0. This gives tan(x) = 1, leading to x = π/4 and x = 5π/4 in the interval [0, 2π].
Correct Answer:
A
— π/4, 5π/4
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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) = sin(x), what is f(π/2)?
-
A.
0
-
B.
1
-
C.
-1
-
D.
undefined
Solution
f(π/2) = sin(π/2) = 1.
Correct Answer:
B
— 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 for x < 0 and f(x) = kx + 1 for x >= 0, find k such that f is differentiable at x = 0.
Solution
Setting the left-hand derivative equal to the right-hand derivative at x = 0 gives k = 2.
Correct Answer:
A
— -1
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Q. If f(x) = x^2 + 2x + 1, find f'(1).
Solution
f'(x) = 2x + 2, thus f'(1) = 2(1) + 2 = 4.
Correct Answer:
C
— 3
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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)?
Solution
Calculating the derivative f'(x) = 2x + 2, we find f'(1) = 4.
Correct Answer:
B
— 3
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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 + 2x + 1, what is the vertex of the parabola?
-
A.
(-1, 0)
-
B.
(0, 1)
-
C.
(-1, 1)
-
D.
(1, 0)
Solution
The vertex form is f(x) = (x + 1)^2, so the vertex is (-1, 0).
Correct Answer:
C
— (-1, 1)
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