Question

Помогтееее срочнооооооо!!!!

Answer 1

Смотри..................

Answer 2

$2x {(x + 7)}^{2} - {x}^{2} (x + 7) = 0 \\ (x + 7)(2x(x + 7) - {x}^{2} ) = 0 \\ (x + 7)(2 {x}^{2} + 14x - {x}^{2} ) = 0 \\ (x + 7)( {x }^{2} + 14x) = 0 \\x (x + 7)(x + 14) = 0 \\ x1 = 0 \\ x 2= - 7 \\ x3 = - 14$