Question

упростите пжж!!!!!
2 х(1 + х ) - ( х - 2 ) ( х +4)

(у + 2 )² - 2 у (у +2)​

Answer 1

$2x(1 + x) - (x - 2)(x + 4) = 2x + 2 {x}^{2} - ( {x}^{2} + 2x - 8) = \\ \\ = 2x + 2 {x}^{2} - {x}^{2} - 2x + 8 = {x}^{2} + 8$

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

Answer 2

Ответ:

1)x²+8

2)-y²+4

Нужно раскрыть скобки. (a+b)²=a²+2ab+b²