Let f(x) = −4x3 − 5x2 − 6x + 2. Find the slope of the graph at x = −1, that is f′(−1).
Derivatives worksheet with answers
1.Easy
f(x) = −4x3 − 5x2 − 6x + 2x = −1
f′(−1) =
2.Easy
Let f(x) = 4x3 − 6x2 − 7x + 5. Find the slope of the graph at x = 1, that is f′(1).
f(x) = 4x3 − 6x2 − 7x + 5x = 1
f′(1) =
3.Medium
Let f(x) = ln(3x2 + 5). Find f′(2).
f(x) = ln(3x2 + 5)x = 2
f′(2) =
4.Medium
Let f(x) = (4x + 5)4. Find f′(2).
f(x) = (4x + 5)4x = 2
f′(2) =
5.Hard
The tangent line to f(x) = −x2 − 2x − 3 at x = −2 crosses the y-axis at y = b. Find b.
f(x) = −x2 − 2x − 3x = −2
b =
6.Hard
The tangent line to f(x) = 2x2 + 5x + 1 at x = 1 crosses the y-axis at y = b. Find b.
f(x) = 2x2 + 5x + 1x = 1
b =
Answer key
- 1. f′(−1) = −8
- 2. f′(1) = −7
- 3. f′(2) = 0.7059
- 4. f′(2) = 35152
- 5. b = 1
- 6. b = −1
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