Calculus
posted by Jake .
Find each function, find f(a+h) and f(a+h)f(a)
a) f(x)=5x2

5(a+h) 2 = 5a + 5h  2
5(a) 2 = 5 a  2
subtract
5 h is the answer
now if we were doing calculus we would divide that by h and then let h go to 0
5 h/h = 5
and we call that the "derivative" of f(x)=5x2 
May I know where you got 5a + 5h  2

f(a+h) = 5(a+h)  2
from your function definition
5(a+h) 2 = 5 a + 5 h  2 
Thank you~