Divide. `(x^2 - 100)/(x^2 -1 x - 90)-:(4 x)/(x + 9)`

State the quotient in simplest form.

`(x^2 - 100)/(x^2 -1 x - 90)-:(4 x)/(x + 9)=`

Enter the numerator and denominator separately in the boxes below. If the denominator is 1, enter the number 1. Do not leave either box blank.