Question

$x(x+10)=1200-$Cрочно!!

Answer 1

Объяснение:

Решение на фотографии ....

Answer 2

Ответ:

$x(x + 10) = 1200 \\ x {}^{2} + 10x = 1200 \\ x {}^{2} + 10x - 1200 = 0 \\ x {}^{2} + 40x - 30x - 1200 = 0 \\ x(x + 40) - 30(x + 40) = 0 \\ (x + 40) \times (x - 30) = 0 \\ \\ x + 40 = 0 \: \: \: \: \: \: \: \: x - 30 = 0 \\ x = - 40 \: \: \: \: \: \: \: \: \: \: \: \: \: x = 30 \\ \\ \\ \\ = = > \\ x = - 40 \: \: \: \: \: \: x = 30$