Question

Factor completely 2x^2 − 18. prime 2(x^2 − 9) 2(x 3)(x − 3) 2(x 3)(x 3)

Answer 1

$2x^2-18=2(x^2-9)=2(x^2-3^2)=2(x-3)(x+3)$

Used:$a^2-b^2=(a-b)(a+b)$