Is #f(x)=(2x+4)^2-6x-7 # increasing or decreasing at #x=-2 #?
1 Answer
Dec 16, 2015
decreasing
Explanation:
Find f ' (x) first. f '(x)= 2(2x+4) *2 -6. Now if f '(-2) is positive, then f(x) is increasing and if it is negative, it is decreasing.
f '(-2) = -6. Hence f(x) is decreasing
