x^4-7x^2-18
factor hellp
x^4-7x^2-18 Factor please:
=(x^2+2) (x-3) (x+3)
x^4 - 7x^2 - 18
x^4 + 2x^2 - 9x^2 - 18
x^2 (x^2 + 2) - 9 (x^2 + 2)
(x^2 + 2) (x^2 - 9)
(x^2 + 2) (x^2 - 3^2)
(x^2 + 2) (x-3) (x+3)
