Question

How do I solve this (x+10)²=36

Answer 1

x=−4,−16 here is your answer.

Answer 2

Go ahead and simplify;
$x^{2} +20x+100=36$
$x^{2} +20x+100-36=0$
$x^{2} +20x+64=0$
$x^{2} +4x+16x+64$
x(x+4)+16(x+4)=0
(x+16)(x+4)=0
x+16=0
x=-16
x+4=0
x=-4