Which expression is a factor of \(x^4 + 14ax^2 + 49a^2 - 64\), where …

Question

Prompt

Which expression is a factor of

x^{4} + 14 a x^{2} + 49 a^{2} - 64

, where

a

is a positive constant?

x^{2} + 7 a + 8

x^{2} - 7 a - 8

x^{2} + 14 a

x^{2} - 8 a