Answer:
-12
Step-by-step explanation:
Let b = -1 and a = -3
The average rate of change = [tex]\frac{f(b) - f(a)}{b - a}[/tex]
f(b) = f(-1) = 3(-1)^2 - 5 = 3 - 5 = -2
f(a) = f(-3) = 3(-3)^2 - 5 =27 - 5 = 22
f(b) - f(a) = -2 - 22 = -24
b - a = -1 + 3 = 2
[tex]\frac{f(b) - f(a)}{b - a}[/tex] = -24/2 = -12