Let f(x) = x3 + 6x2 + 3x. Find the slope of the graph at x = −3, that is f′(−3).
Derivatives worksheet with answers
1.Easy
f(x) = x3 + 6x2 + 3xx = −3
f′(−3) =
2.Easy
Let f(x) = x4 + x2 − 7x − 4. Find the slope of the graph at x = −1, that is f′(−1).
f(x) = x4 + x2 − 7x − 4x = −1
f′(−1) =
3.Medium
Let f(x) = (4x + 3)4. Find f′(1).
f(x) = (4x + 3)4x = 1
f′(1) =
4.Medium
Let f(x) = x·sin(x), with x in radians. Find f′(1).
f(x) = x·sin(x)x = 1 rad
f′(1) =
5.Hard
Let f(x) = x3 + 4.5x2 − 1. Find the x-coordinate x of the local maximum.
f(x) = x3 + 4.5x2 − 1
x =
6.Hard
Let f(x) = x3 − 12x2 + 45x + 5. Find the x-coordinate x of the local maximum.
f(x) = x3 − 12x2 + 45x + 5
x =
Answer key
- 1. f′(−3) = −6
- 2. f′(−1) = −13
- 3. f′(1) = 5488
- 4. f′(1) = 1.382
- 5. x = −3
- 6. x = 3
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