1 answer

Is #f(x)=-2x^3-5x^2-6x-1# increasing or decreasing at #x=1#?

Question:

Is #f(x)=-2x^3-5x^2-6x-1# increasing or decreasing at #x=1#?

Answers

DECREASING

Explanation:

The given function #f(x) = -2x^3- 5x^2 - 6x-1# at #x=1#

take the first derivative and then evaluate it at #x=1#

#f' (x)= -6x^2-10x-6#

at #x=1#

#f' (1)=-6(1)^2-10(1)-6#

#f' (1)=-6-10-6#

#f' (1) = -22# Negative sign means DECREASING

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