Question

(x+9)^2=(x+1)^2
Помогите!

Answer 1

х^2+18х+81=х^2+2х+1
х^2+18х-х^2-2х=1-81
16х=-80
х=-80÷16
х=-5

Answer 2

$(x+9)^2=(x+1)^2$
$(x+9)(x+9)=(x+1)(x+1)$
$x^2+18x+81=x^2+2x+1$
$18x-2x=-80$
$16x=-80$
$x=-5$