How do you find the instantaneous rate of change of the function #f(x) = -9x^(2) -x# when x=-4?
1 Answer
Mar 21, 2016
71
Explanation:
The instantaneous rate of change is the value of the derivative at x = -4.
# f'(x) = -18x - 1 #
#rArr f'(-4) = -18(-4) - 1 = 72 - 1 = 71 #
