Q. If f(x) = x^2 sin(1/x) for x ≠ 0 and f(0) = 0, is f differentiable at x = 0?
A.
Yes
B.
No
C.
Only left differentiable
D.
Only right differentiable
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Solution
Using the limit definition of the derivative, f'(0) exists, hence f is differentiable at x = 0.
Correct Answer: A — Yes
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Q. If f(x) = x^3 - 3x + 2, find the critical points where f'(x) = 0.
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Solution
Set f'(x) = 3x^2 - 3 = 0 and solve for x.
Correct Answer: B — 0
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Q. If f(x) = x^3 - 3x + 2, find the points where f is not differentiable.
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Solution
The function is a polynomial and is differentiable everywhere, hence no points of non-differentiability.
Correct Answer: A — 0
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Q. If f(x) = x^3 - 3x + 2, then f(x) is continuous at:
A.
All x
B.
x = 0
C.
x = 1
D.
x = -1
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Solution
f(x) is a polynomial function and is continuous for all x.
Correct Answer: A — All x
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Q. If f(x) = x^3 - 3x^2 + 4, find the critical points of f.
A.
x = 0, 1, 2
B.
x = 1, 2
C.
x = 0, 2
D.
x = 1
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Solution
f'(x) = 3x^2 - 6x. Setting f'(x) = 0 gives 3x(x - 2) = 0, so x = 0 and x = 2 are critical points.
Correct Answer: B — x = 1, 2
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Q. If f(x) = x^3 - 3x^2 + 4, find the point where f is not differentiable.
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Solution
The function is a polynomial and is differentiable everywhere, but checking critical points shows f'(x) = 0 at x = 2.
Correct Answer: C — 2
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Q. If f(x) = x^3 - 3x^2 + 4, find the point where the function has a local minimum.
A.
(1, 2)
B.
(2, 1)
C.
(3, 4)
D.
(0, 4)
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Solution
f'(x) = 3x^2 - 6x. Setting f'(x) = 0 gives x(3x - 6) = 0, so x = 0 or x = 2. f''(2) = 6 > 0, so (2, f(2)) = (2, 1) is a local minimum.
Correct Answer: A — (1, 2)
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Q. If f(x) = x^3 - 3x^2 + 4, then f'(1) is equal to?
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Solution
f'(x) = 3x^2 - 6x; f'(1) = 3(1)^2 - 6(1) = 3 - 6 = -3.
Correct Answer: B — 2
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Q. If f(x) = x^3 - 3x^2 + 4, then f'(2) is equal to?
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Solution
f'(x) = 3x^2 - 6x; f'(2) = 3(2^2) - 6(2) = 12 - 12 = 0.
Correct Answer: B — 1
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Q. If f(x) = x^3 - 3x^2 + 4, then the local maxima and minima occur at which of the following points?
A.
(0, 4)
B.
(1, 2)
C.
(2, 2)
D.
(3, 4)
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Solution
To find local maxima and minima, we first find f'(x) = 3x^2 - 6x. Setting f'(x) = 0 gives x(3x - 6) = 0, so x = 0 or x = 2. Evaluating f(1) = 2 shows it is a local minimum.
Correct Answer: B — (1, 2)
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Q. If f(x) = x^3 - 3x^2 + 4, then the local maxima occurs at which point?
A.
x = 0
B.
x = 1
C.
x = 2
D.
x = 3
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Solution
To find local maxima, we first find f'(x) = 3x^2 - 6x. Setting f'(x) = 0 gives x(3x - 6) = 0, so x = 0 or x = 2. Checking the second derivative f''(x) = 6x - 6, we find f''(2) < 0, indicating a local maxima at x = 2.
Correct Answer: B — x = 1
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Q. If f(x) = x^3 - 3x^2 + 4, then the local maxima occurs at x = ?
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Solution
To find local maxima, we first find f'(x) = 3x^2 - 6. Setting f'(x) = 0 gives x^2 - 2 = 0, so x = ±√2. Evaluating f''(x) at x = 1 gives f''(1) = 0, indicating a point of inflection. Thus, local maxima occurs at x = 1.
Correct Answer: B — 1
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Q. If f(x) = x^3 - 6x^2 + 9x, find the critical points.
A.
(0, 0)
B.
(3, 0)
C.
(2, 0)
D.
(1, 0)
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Solution
f'(x) = 3x^2 - 12x + 9. Setting f'(x) = 0 gives (x - 3)(x - 1) = 0, so critical points are x = 1 and x = 3.
Correct Answer: B — (3, 0)
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Q. If f(x) = x^4 - 4x^3 + 6x^2 - 4x + 1, find f'(1).
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Solution
Calculating f'(x) = 4x^3 - 12x^2 + 12x - 4. Thus, f'(1) = 4 - 12 + 12 - 4 = 0.
Correct Answer: A — 0
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Q. If f(x) = x^4 - 4x^3 + 6x^2 - 4x + 1, find f'(2).
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Solution
f'(x) = 4x^3 - 12x^2 + 12x - 4; f'(2) = 0.
Correct Answer: A — 0
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Q. If f(x) = x^4 - 4x^3 + 6x^2 - 4x + 1, what is f'(1)?
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Solution
f'(x) = 4x^3 - 12x^2 + 12x - 4; f'(1) = 0.
Correct Answer: A — 0
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Q. If f(x) = x^4 - 4x^3 + 6x^2, find f'(2).
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Solution
f'(x) = 4x^3 - 12x^2 + 12x; f'(2) = 4(2^3) - 12(2^2) + 12(2) = 32 - 48 + 24 = 8.
Correct Answer: A — 0
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Q. If f(x) = x^4 - 8x^2 + 16, then the points of inflection are at:
A.
x = 0
B.
x = ±2
C.
x = ±4
D.
x = 2
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Solution
To find points of inflection, we find f''(x) = 12x^2 - 16. Setting f''(x) = 0 gives x^2 = 4, so x = ±2 are points of inflection.
Correct Answer: B — x = ±2
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Q. If f(x) = { 2x + 3, x < 0; kx + 1, x >= 0 } is continuous at x = 0, what is the value of k?
A.
-3/2
B.
1/2
C.
3/2
D.
2
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Solution
Setting the two pieces equal at x = 0: 3 = k(0) + 1. Solving gives k = -3/2.
Correct Answer: A — -3/2
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Q. If f(x) = { x^2 + 1, x < 0; k, x = 0; 2x + 1, x > 0 } is continuous at x = 0, what is k?
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Solution
For continuity at x = 0, we need the left limit (1) to equal k. Thus, k = 1.
Correct Answer: A — 1
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Q. If f(x) = { x^2 + 1, x < 0; k, x = 0; 2x + 1, x > 0 }, what value of k makes f continuous at x = 0?
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Solution
To be continuous at x = 0, k must equal the limit from the left, which is 1.
Correct Answer: B — 1
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Q. If f(x) = { x^2 + 1, x < 0; k, x = 0; 2x, x > 0 }, for f(x) to be continuous at x = 0, k must be:
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Solution
For continuity at x = 0, k must equal the limit as x approaches 0, which is 1.
Correct Answer: B — 1
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Q. If f(x) = { x^2 + 1, x < 0; kx + 2, x = 0; 3 - x, x > 0 is continuous at x = 0, find k.
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Solution
For continuity at x = 0, we need 1 = 2, thus k must be 1.
Correct Answer: B — 2
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Q. If f(x) = { x^2 + 1, x < 0; kx + 3, x = 0; 2x - 1, x > 0 is continuous at x = 0, find k.
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Solution
For continuity at x = 0, we need 1 = 3 and 1 = -1 + 3k, solving gives k = 1.
Correct Answer: C — 1
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Q. If f(x) = { x^2, x < 0; 2x + 3, x >= 0 }, find f(0).
A.
0
B.
3
C.
1
D.
undefined
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Solution
At x = 0, we use the second piece: f(0) = 2(0) + 3 = 3.
Correct Answer: B — 3
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Q. If f(x) = { x^2, x < 0; kx + 1, x >= 0 } is differentiable at x = 0, what is k?
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Solution
Setting the derivatives equal at x = 0 gives k = 0.
Correct Answer: B — 0
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Q. If f(x) = { x^2, x < 0; kx + 1, x = 0; 2x + 3, x > 0 is continuous at x = 0, find k.
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Solution
To ensure continuity at x = 0, we set k(0) + 1 = 0^2, leading to k = 2.
Correct Answer: C — 1
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Q. If f(x) = { x^2, x < 1; kx + 1, x >= 1 } is continuous at x = 1, find k.
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Solution
Setting the two pieces equal at x = 1 gives 1 = k + 1, hence k = 0.
Correct Answer: B — 1
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Q. If f(x) = { x^2, x < 2; 4, x = 2; 2x, x > 2 } is continuous at x = 2, what is the value of f(2)?
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Solution
For continuity at x = 2, f(2) must equal the limit from both sides, which is 4.
Correct Answer: B — 4
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Q. If f(x) = { x^2, x < 3; k, x = 3; 2x, x > 3 } is continuous at x = 3, what is the value of k?
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Solution
For continuity at x = 3, we need limit as x approaches 3 from left (9) to equal f(3) = k, thus k = 9.
Correct Answer: C — 6
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