Question

If Q(x)=x^2-5x+1 find

Q(2+h)-Q(2)
h

Answer 1

its dQ/dx at x=2
=2x-5 now plug x=2
= -1

Answer 2

The answer is actually h-1. I just want to know how to get to that answer? If it helps the equation is all over h.

Answer 3

lets see..
(4 + h^2 +4h - 10 -5h +1 -4+10-1)/h
(h^2-h)/h
h-1.,
i was calculating when h tends to 0