Answer:
b
Step-by-step explanation:
the answer is b
f(5) = 5
F(x)=x^2 - 4x
Let x = 5
F(5)=5^2 - 4*5
= 25 - 20
= 5
-23
I just did 8+15=23 but made it negative. so you can do
-23+8= -15
