Question

Solve for x in the equation x2 - 12x + 36 = 90

Answer 1

$x^2 - 12x + 36 = 90 \\ (x-6)^2=90\\ x-6=\sqrt{90} \vee x-6=-\sqrt{90}\\ x=6+3\sqrt{10} \vee x=6-3\sqrt{10}$