Question

For f(x)=-2x^2+2x+3 find f(3+h)-f(3)/h

Answer 1

Hello,


`f(x)=2x^2+2x+3\\ f(3)=2*3^2+2*3+3=18+6+3\\ f(3+h)=2(3+h)^2+2*(3+h)+3\\\\ =2(9+6h+h^2)+6+2h+3\\\\ =2h^2+14h+18+6+3\\\\ (f(3+h)-f(3))/(h) = (2h^2+14h+18+6+3-(18+6+3))/(h) \\ = (2h^2+14h)/(h) )=2h+14`