Question

Factor completely

25x^4 - 49

(5x^2 + 7)(5x^2 - 7)

(5x^2 + 7)(5x^2 + 7)

x^2(5x + 7)(5x - 7)

(5x^2 - 7)(5x^2 - 7)

Answer 1

what do you mean

Explanation:

Answer 2

x^2(5x + 7)(5x - 7)

Explanation:

Considering you need a negative and a positive to get a negative number, the second and fourth options are wrong. The first option still needs to factor out x^2, which is why x^2(5x + 7)(5x - 7) is correct.