Question

Which one? And show work

Answer 1

we are given

$(8x^4-128)$

Firstly , we can factor out 8

$8(x^4-16)$

now, we can rewrite it

$8(x^4-(2)^4)$

now, we can use formula

$(a^4-b^4)=(a^2+b^2)(a-b)(a+b)$

so, we will get

$8(x^4-(2)^4)=8(x^2+4)(x-2)(x+2)$.............Answer