Question

решить кв.ур.
(x-5)2=5(9-2x)

Answer 1

$(x-5) ^{2} = 45-10 x$
$x^{2} - 10x + 25 = 45 - 10x$
$x^{2} - 20 = 0$
$x^{2} = 20$
$x = sqrt{20}$