Let f(x) = x3 + 8x2 − 4x + 8. Find the slope of the graph at x = 3, that is f′(3).
Derivatives worksheet with answers
1.Easy
f(x) = x3 + 8x2 − 4x + 8x = 3
f′(3) =
2.Easy
Let f(x) = −4x4 − 3x2 − 6x + 2. Find the slope of the graph at x = −2, that is f′(−2).
f(x) = −4x4 − 3x2 − 6x + 2x = −2
f′(−2) =
3.Medium
Let f(x) = x·sin(3x), with x in radians. Find f′(2).
f(x) = x·sin(3x)x = 2 rad
f′(2) =
4.Medium
Let f(x) = (3x + 1)5. Find f′(0).
f(x) = (3x + 1)5x = 0
f′(0) =
5.Hard
Let f(x) = x3 + 6x2 + 2. Find the x-coordinate x of the local maximum.
f(x) = x3 + 6x2 + 2
x =
6.Hard
The tangent line to f(x) = x2 + 2x + 2 at x = 1 crosses the y-axis at y = b. Find b.
f(x) = x2 + 2x + 2x = 1
b =
Answer key
- 1. f′(3) = 71
- 2. f′(−2) = 134
- 3. f′(2) = 5.482
- 4. f′(0) = 15
- 5. x = −4
- 6. b = 1
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