Question

A) (2x +1)² +(x-5)²
B) (x- 1)² -(x+1)²

Answer 1

Resposta:

Explicação passo a passo:

$(a+b)^{2} =a^{2}+2ab+b^{2}$

$(a-b)^{2} =a^{2}-2ab+b^{2}$

$a)$

$(2x+1)^{2} +(x-5)^{2} =$

$4x^{2} +4x+1+x^{2} -10x+25=$

$4x^{2} +x^{2} +4x-10x+1+25=$

$5x^{2} -6x+26$

$b)$

$(x-1)^{2} -(x+1)^{2} =$

$x^{2} -2x+1-(x^{2} +2x+1)=$

$x^{2} -2x+1-x^{2} -2x-1=$

$x^{2} -x^{2} -2x-2x+1-1=$

           $-4x$