Let f(x) = x3 − 8x2 − 4x − 7. Find the slope of the graph at x = 2, that is f′(2).
Derivatives worksheet with answers
1.Easy
f(x) = x3 − 8x2 − 4x − 7x = 2
f′(2) =
2.Easy
Let f(x) = −2x4 − 2x2 + x + 5. Find the slope of the graph at x = −2, that is f′(−2).
f(x) = −2x4 − 2x2 + x + 5x = −2
f′(−2) =
3.Medium
Let f(x) = x·sin(x), with x in radians. Find f′(2).
f(x) = x·sin(x)x = 2 rad
f′(2) =
4.Medium
Let f(x) = x3·ex. Find f′(1.5).
f(x) = x3·exx = 1.5
f′(1.5) =
5.Hard
Let f(x) = x3 − 12x − 4. Find the x-coordinate x of the local maximum.
f(x) = x3 − 12x − 4
x =
6.Hard
The tangent line to f(x) = 0.5x2 + 4x + 2 at x = 3 crosses the y-axis at y = b. Find b.
f(x) = 0.5x2 + 4x + 2x = 3
b =
Answer key
- 1. f′(2) = −24
- 2. f′(−2) = 73
- 3. f′(2) = 0.077
- 4. f′(1.5) = 45.38
- 5. x = −2
- 6. b = −2.5
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