Let f(x) = −5x3 + 3x2 + x + 8. Find the slope of the graph at x = −1, that is f′(−1).
Derivatives worksheet with answers
1.Easy
f(x) = −5x3 + 3x2 + x + 8x = −1
f′(−1) =
2.Easy
Let f(x) = 4x5 + 5x2 + 8x + 4. Find the slope of the graph at x = 2, that is f′(2).
f(x) = 4x5 + 5x2 + 8x + 4x = 2
f′(2) =
3.Medium
Let f(x) = x·sin(x), with x in radians. Find f′(0.5).
f(x) = x·sin(x)x = 0.5 rad
f′(0.5) =
4.Medium
Let f(x) = x2·ex. Find f′(2).
f(x) = x2·exx = 2
f′(2) =
5.Hard
Let f(x) = x3 + 6x2 + 9x + 1. Find the x-coordinate x of the local minimum.
f(x) = x3 + 6x2 + 9x + 1
x =
6.Hard
The tangent line to f(x) = −x2 − 2 at x = 2 crosses the y-axis at y = b. Find b.
f(x) = −x2 − 2x = 2
b =
Answer key
- 1. f′(−1) = −20
- 2. f′(2) = 348
- 3. f′(0.5) = 0.9182
- 4. f′(2) = 59.11
- 5. x = −1
- 6. b = 2
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