Question

Help would be very much appreciated

Answer 1

`(f(2+h)-f(2))/(h)=((2+h)^2+2(2+h)-1-(2^2+2\cdot2-1))/(h)=\\\\=(4+4h+h^2+4+2h-1-(4+4-1))/(h)=(h^2+6h+7-7)/(h)=(h^2+6h)/(h)=h+6`