Let f(x) = −4x3 − 3x2 − 3x + 1. Find the slope of the graph at x = −1, that is f′(−1).
Derivatives worksheet with answers
1.Easy
f(x) = −4x3 − 3x2 − 3x + 1x = −1
f′(−1) =
2.Easy
Let f(x) = 5x5 + 9x2 − 4x + 3. Find the slope of the graph at x = 2, that is f′(2).
f(x) = 5x5 + 9x2 − 4x + 3x = 2
f′(2) =
3.Medium
Let f(x) = (−2x − 3)3. Find f′(1).
f(x) = (−2x − 3)3x = 1
f′(1) =
4.Medium
Let f(x) = x·e−x. Find f′(2).
f(x) = x·e−xx = 2
f′(2) =
5.Hard
The tangent line to f(x) = −x2 − 2x + 1 at x = −2 crosses the y-axis at y = b. Find b.
f(x) = −x2 − 2x + 1x = −2
b =
6.Hard
The tangent line to f(x) = 0.5x2 + 2x + 1 at x = 1 crosses the y-axis at y = b. Find b.
f(x) = 0.5x2 + 2x + 1x = 1
b =
Answer key
- 1. f′(−1) = −9
- 2. f′(2) = 432
- 3. f′(1) = −150
- 4. f′(2) = −0.1353
- 5. b = 5
- 6. b = 0.5
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