Let f(x) = −x4 + 2x2 − 7x + 7. Find the slope of the graph at x = −3, that is f′(−3).
Derivatives worksheet with answers
1.Easy
f(x) = −x4 + 2x2 − 7x + 7x = −3
f′(−3) =
2.Easy
Let f(x) = −3x3 − 6x2 − 5x − 4. Find the slope of the graph at x = −3, that is f′(−3).
f(x) = −3x3 − 6x2 − 5x − 4x = −3
f′(−3) =
3.Medium
Let f(x) = x·e−0.5x. Find f′(1).
f(x) = x·e−0.5xx = 1
f′(1) =
4.Medium
Let f(x) = (3x + 5)5. Find f′(1).
f(x) = (3x + 5)5x = 1
f′(1) =
5.Hard
The tangent line to f(x) = 2x2 − 4x − 5 at x = 1 crosses the y-axis at y = b. Find b.
f(x) = 2x2 − 4x − 5x = 1
b =
6.Hard
The tangent line to f(x) = −x2 − 5x + 5 at x = −2 crosses the y-axis at y = b. Find b.
f(x) = −x2 − 5x + 5x = −2
b =
Answer key
- 1. f′(−3) = 89
- 2. f′(−3) = −50
- 3. f′(1) = 0.3033
- 4. f′(1) = 61440
- 5. b = −7
- 6. b = 9
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