Question

Решите уравнение (x+2)(5-2x)=x

Answer 1

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Answer 2

Думаю так правильно
$(x + 2)(5 - 2x) = x$
$5x - 2x {}^{2} + 10 - 4x - x = 0$
$- 2x + 10 = 0 | -1|$
$2x ^{2} - 10 = 0$
$2(x {}^{2} - 5) = 0$
$(x - sqrt{5)} (x + sqrt{5} ) = 0$
$x - sqrt{5 } = 0 \ x = sqrt{5 } \ x + sqrt{5} = 0 \ x = - sqrt{5}$