Simplify ((x^2-11x+30)/(x^2-4))÷((x^2+3x-40)/(x-2))

Consider the form ${\displaystyle x^2+bx+c}$. Find a pair of integers whose product is ${\displaystyle c}$ and whose sum is ${\displaystyle b}$. In this case, whose product is ${\displaystyle 30}$ and whose sum is ${\displaystyle -11}$.

Write the factored form using these integers.

Rewrite ${\displaystyle 4}$ as ${\displaystyle 2^2}$.

Since both terms are perfect squares, factor using the difference of squares formula, ${\displaystyle a^2-b^2=(a+b)(a-b)}$ where ${\displaystyle a=x}$ and ${\displaystyle b=2}$.

Cancel the common factor of ${\displaystyle x-2}$.

Multiply ${\displaystyle \frac{(x-6)(x-5)}{x+2}}$ by ${\displaystyle \frac{1}{x^2+3x-40}}$.

Consider the form ${\displaystyle x^2+bx+c}$. Find a pair of integers whose product is ${\displaystyle c}$ and whose sum is ${\displaystyle b}$. In this case, whose product is ${\displaystyle -40}$ and whose sum is ${\displaystyle 3}$.

Write the factored form using these integers.

Cancel the common factor.

Rewrite the expression.