Question

( x+7)²-(x-11)(x+11)=
Треба спростити.
Помогите!!!!!!

Answer 1

$\left(x+7\right)^2-\left(x-11\right)\left(x+11\right)=\\=x^2+14x+49-\left(x-11\right)\left(x+11\right)=\\=x^2+14x+49-x^2+121=\\=14x+170$

Answer 2

${(x + 7)}^{2} - (x - 11)(x + 11) = {x}^{2} + 14x + 49 - ( {x}^{2} - 121) = {x}^{2} + 14x + 49 - {x}^{2} + 121 = 14x + 170 = 2(7x + 85)$