Let f(x) = −x4 − 4x2 + 8x − 3. Find the slope of the graph at x = 3, that is f′(3).
Derivatives worksheet with answers
1.Easy
f(x) = −x4 − 4x2 + 8x − 3x = 3
f′(3) =
2.Easy
Let f(x) = −3x4 − 6x2 + 6x. Find the slope of the graph at x = −1, that is f′(−1).
f(x) = −3x4 − 6x2 + 6xx = −1
f′(−1) =
3.Medium
Let f(x) = (2x + 3)5. Find f′(−1).
f(x) = (2x + 3)5x = −1
f′(−1) =
4.Medium
Let f(x) = x·sin(3x), with x in radians. Find f′(0.5).
f(x) = x·sin(3x)x = 0.5 rad
f′(0.5) =
5.Hard
Let f(x) = x3 − 15x2 + 63x − 4. Find the x-coordinate x of the local maximum.
f(x) = x3 − 15x2 + 63x − 4
x =
6.Hard
The tangent line to f(x) = 3x2 + 5x + 6 at x = 2 crosses the y-axis at y = b. Find b.
f(x) = 3x2 + 5x + 6x = 2
b =
Answer key
- 1. f′(3) = −124
- 2. f′(−1) = 30
- 3. f′(−1) = 10
- 4. f′(0.5) = 1.104
- 5. x = 3
- 6. b = −6
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