Let f(x) = −x5 − 4x2 − 8x − 9. Find the slope of the graph at x = 2, that is f′(2).
Derivatives worksheet with answers
1.Easy
f(x) = −x5 − 4x2 − 8x − 9x = 2
f′(2) =
2.Easy
Let f(x) = 2x3 − 9x2 − 9. Find the slope of the graph at x = −1, that is f′(−1).
f(x) = 2x3 − 9x2 − 9x = −1
f′(−1) =
3.Medium
Let f(x) = x·e0.5x. Find f′(1.5).
f(x) = x·e0.5xx = 1.5
f′(1.5) =
4.Medium
Let f(x) = x3·e−0.5x. Find f′(0.5).
f(x) = x3·e−0.5xx = 0.5
f′(0.5) =
5.Hard
The tangent line to f(x) = x2 − 4x at x = −2 crosses the y-axis at y = b. Find b.
f(x) = x2 − 4xx = −2
b =
6.Hard
The tangent line to f(x) = 0.5x2 + 2x − 6 at x = −1 crosses the y-axis at y = b. Find b.
f(x) = 0.5x2 + 2x − 6x = −1
b =
Answer key
- 1. f′(2) = −104
- 2. f′(−1) = 24
- 3. f′(1.5) = 3.705
- 4. f′(0.5) = 0.5354
- 5. b = −4
- 6. b = −6.5
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