Question 682087
{{{1/(x+h)^2 - 1/x^2}}}
Create a common denominator
{{{(1/(x+h)^2)(x^2/x^2) - (1/x^2)((x+h)^2/(x+h)^2)}}
...
{{{(x^2-(x+h)^2)/(x^2(x+h)^2)}}}
denominator
{{{x^2(x+h)^2 = x^2(x^2+2hx+h^2) = x^4+2hx^3+x^2h^2}}}
numerator
{{{x^2 - (x^2+2hx+h^2) = x^2 - x^2 - 2hx - h^2 = -2xh-h^2}}}
...
{{{(-2xh-h^2)/(x^4+2hx^3+x^2h^2)}}}
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