Let f(x) = 2x4 − 2x2 + 8x + 4. Find the slope of the graph at x = −1, that is f′(−1).
Derivatives worksheet with answers
1.Easy
f(x) = 2x4 − 2x2 + 8x + 4x = −1
f′(−1) =
2.Easy
Let f(x) = 3x5 + 8x2 − 4x. Find the slope of the graph at x = 3, that is f′(3).
f(x) = 3x5 + 8x2 − 4xx = 3
f′(3) =
3.Medium
Let f(x) = ln(x2 + 5). Find f′(3).
f(x) = ln(x2 + 5)x = 3
f′(3) =
4.Medium
Let f(x) = x·ex. Find f′(2).
f(x) = x·exx = 2
f′(2) =
5.Hard
The tangent line to f(x) = 2x2 − x − 5 at x = −2 crosses the y-axis at y = b. Find b.
f(x) = 2x2 − x − 5x = −2
b =
6.Hard
The tangent line to f(x) = 2x2 − 2x + 1 at x = −1 crosses the y-axis at y = b. Find b.
f(x) = 2x2 − 2x + 1x = −1
b =
Answer key
- 1. f′(−1) = 4
- 2. f′(3) = 1259
- 3. f′(3) = 0.4286
- 4. f′(2) = 22.17
- 5. b = −13
- 6. b = −1
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