Let f(x) = −x4 − 7x2 + 7x + 4. Find the slope of the graph at x = 1, that is f′(1).
Derivatives worksheet with answers
1.Easy
f(x) = −x4 − 7x2 + 7x + 4x = 1
f′(1) =
2.Easy
Let f(x) = −3x4 + 9x2 + 9x − 4. Find the slope of the graph at x = −3, that is f′(−3).
f(x) = −3x4 + 9x2 + 9x − 4x = −3
f′(−3) =
3.Medium
Let f(x) = x3·ex. Find f′(0.5).
f(x) = x3·exx = 0.5
f′(0.5) =
4.Medium
Let f(x) = ln(2x2 + 2). Find f′(2).
f(x) = ln(2x2 + 2)x = 2
f′(2) =
5.Hard
The tangent line to f(x) = 3x2 + 4x − 4 at x = −1 crosses the y-axis at y = b. Find b.
f(x) = 3x2 + 4x − 4x = −1
b =
6.Hard
Let f(x) = x3 + 1.5x2 − 6x + 3. Find the x-coordinate x of the local maximum.
f(x) = x3 + 1.5x2 − 6x + 3
x =
Answer key
- 1. f′(1) = −11
- 2. f′(−3) = 279
- 3. f′(0.5) = 1.443
- 4. f′(2) = 0.8
- 5. b = −7
- 6. x = −2
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