Question

Solve x4 – 10x2 + 9 = 0.

x = ±1 or x = ±3
x = ±3 or x = ±i
x = ±1 or x = mc074-1.jpg
x = ±3 or x = mc074-2.jpg

Answer 1

(x2 -9)(x2 -1) = 0

Answer 2

set your factors to zero and you have your answer

Answer 3

so i.e. would be 3 or 1?

Answer 4

(x2 -9) = 0 , (x2 -1) = 0
Solve for x on both