Cofused on how to factor?

Question

2t^4x^4 -32x^4

Answer 1

Remember that a^2 - b^2 = (a+b)(a-b)

2x^4 is common:

2x^4(t^4 - 16)
= 2x^4((t^2)^2 - 4^2))
= 2x^4(t^2 + 4)(t^2 - 4)
= 2x^4(t^2 + 4)(t^2 - 2^2)
= 2x^4(t^2 + 4)(t + 2)(t - 2)
= 2x^4(t+2)(t-2)(t^2+4)

Answer 2

2t^4x^4 -32x^4

2x^4 (t^4 - 16)

2x^4 (t² - 4)(t² + 4)

2x^4 (t + 2)(t - 2)(t² + 4)
.

Answer 3

2x^4(t^4-16)
2x^4(t^2-4)(t^2+4)
2x^4(t-2)(t+2)(t^2+4)