Question

Factorizar x a la cuatro menos 16

Answer 1

$\times {}^{4} - 16 = ( \times {}^{2} - 4)( \times {}^{2} + 4) \\ = ( \times - 2)( \times + 2)( \times {}^{2} + 4) \\ ( \times {}^{2} + 4)$