Question 673041
3(x+3)^2 = 36 
divide both sides by 3 and you have
(x+3)^2 = 12
Find the square root of both sides
x + 3 = +/-{{{sqrt(12)}}}
Factor to reveal a perfect square inside the radical
x + 3 = +/-{{{sqrt(4*3)}}}
Extract the square root of 4
x + 3 = +/-{{{2*sqrt(3)}}}
Two solutions
x = -3 + {{{2*sqrt(3)}}}
and 
x = -3 - {{{2*sqrt(3)}}}