Simplify dfracx2−462x−21\\dfrac{x^2 - 462}{x - 21}dfracx2−462x−21 for xneq21x \\neq 21xneq21
x+22x + 22x+22
x−21x - 21x−21
x−22x - 22x−22
x+21x + 21x+21