Question 242935
{{{((x+9)/(x+7))((x-9)/(x-9))}}} Start with the given expression.



{{{((x+9)(x-9))/((x+7)(x-9))}}} Combine the fractions.



{{{(x^2-81)/(x^2-2x-63)}}} FOIL



So {{{((x+9)/(x+7))((x-9)/(x-9))=(x^2-81)/(x^2-2x-63)}}}