Question

Reducir: (a + 1)(a -2)(a - 1)(a + 2)

Answer 1

Respuesta:

${a}^{4} - 5 {a}^{2} + 4$

Explicación paso a paso:

$( {a}^{2} - 1)(a - 2)(a + 2)$

$( {a}^{2} - 1)( {a}^{2} - 4)$

${a}^{4} - 4 {a}^{2} - {a}^{2} + 4$

${a}^{4} - 5 {a}^{2} + 4$