Simplify dfracx2−90x−9\\dfrac{x^2 - 90}{x - 9}dfracx2−90x−9 for xneq9x \\neq 9xneq9
x+9x + 9x+9
x+10x + 10x+10
x−10x - 10x−10
x−9x - 9x−9