Question 731458
{{{
((1/(x + h)^2 - 1/x^2)/h)=(1/h)(1/(x + h)^2 - 1/x^2)
}}}


{{{
(1/h)(1/(x + h)^2 - 1/x^2)=(1/h)((-2xh-h^2)/((x^2)(x+h)^2))
}}}


{{{
(1/h)((-2xh-h^2)/((x^2)(x+h)^2))=(-2x-h)/((x^2)(x+h)^2)
}}}