Question

Factor.
x^4+12x^2+20

Answer 1

`(x^2+2)(x^2+10)`

Explanation:

`x^4+12x^2+20=(x^4+2x^2)+(10x^2+20)` separating middle term

`x^2(x^2+2)+10(x^2+2)` factoring out common denom.

`(x^2+2)(x^2+10)` combining