Question

Factor each:
x^8-13x^4+36=0

Answer 1

Explanation:

a = x^4

a^2 - 13a +36 = 0

(a-4)*(a-9)=0

a = 4, a = 9

so

x^4 = 4, x^4 = 9

x = + or - 4th root of 9 and 4