Question

X^2+2x=35 completing the square

Answer 1

$x^2+2x=35$
$x^2+2x+1=35+1$
$(x+1)^2=36$
$(x+1)^2=6^2$
$x+1=6\lor x+1=-6$
$x=6-1\lor x=-6-1$
$\boxed{x=5\lor x=-7}$