Let f(x) = 3x5 − 5x2 − 9x − 2. Find the slope of the graph at x = −3, that is f′(−3).
Derivatives worksheet with answers
1.Easy
f(x) = 3x5 − 5x2 − 9x − 2x = −3
f′(−3) =
2.Easy
Let f(x) = −5x5 + 5x2 − 5. Find the slope of the graph at x = 3, that is f′(3).
f(x) = −5x5 + 5x2 − 5x = 3
f′(3) =
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 − 3)4. Find f′(2).
f(x) = (3x − 3)4x = 2
f′(2) =
5.Hard
The tangent line to f(x) = 2x2 − 5x + 5 at x = 2 crosses the y-axis at y = b. Find b.
f(x) = 2x2 − 5x + 5x = 2
b =
6.Hard
The tangent line to f(x) = 2x2 + x − 5 at x = 1 crosses the y-axis at y = b. Find b.
f(x) = 2x2 + x − 5x = 1
b =
Answer key
- 1. f′(−3) = 1236
- 2. f′(3) = −1995
- 3. f′(2) = 5.482
- 4. f′(2) = 324
- 5. b = −3
- 6. b = −7
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