Question

Factor completely. x^4 - 9.

Answer 1

Answer:

$(x^2+3)(x^2-3)$

Step-by-step explanation:

Since both are perfect squares use the difference of squares formula $a^2-b^2=(a+b)(a-b)$ with a = $x^{2}$ and b = 3

=$(x^2 +3)(x^2-3)$