Let f(x) = −4x5 + 3x2 − x + 7. Find the slope of the graph at x = −1, that is f′(−1).
Derivatives worksheet with answers
1.Easy
f(x) = −4x5 + 3x2 − x + 7x = −1
f′(−1) =
2.Easy
Let f(x) = −3x4 − x2 + 5x − 8. Find the slope of the graph at x = 3, that is f′(3).
f(x) = −3x4 − x2 + 5x − 8x = 3
f′(3) =
3.Medium
Let f(x) = x·sin(x), with x in radians. Find f′(1.5).
f(x) = x·sin(x)x = 1.5 rad
f′(1.5) =
4.Medium
Let f(x) = (−2x + 3)5. Find f′(−1).
f(x) = (−2x + 3)5x = −1
f′(−1) =
5.Hard
Let f(x) = x3 − 3x2 + 6. Find the x-coordinate x of the local minimum.
f(x) = x3 − 3x2 + 6
x =
6.Hard
The tangent line to f(x) = 2x2 + 3x − 5 at x = 1 crosses the y-axis at y = b. Find b.
f(x) = 2x2 + 3x − 5x = 1
b =
Answer key
- 1. f′(−1) = −27
- 2. f′(3) = −325
- 3. f′(1.5) = 1.104
- 4. f′(−1) = −6250
- 5. x = 2
- 6. b = −7
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