Question

Factor the polynomial expression x4 + 18x2 + 81

Answer 1

Answer:
`(x^2+9)^2`

Explanation:

Rewrite it in the form
`a^2+2ab+b^2` , where
`a=x^2 and b=9.`

`(x^2)^2+2(x^2)(9)+9^2`

Use Square of Sum:
`(a+b)^2= a^2+2ab+b^2`

`(x^2+9)^2`