Question 673041
{{{ 3(x+3)^2 = 36 }}}
I can say {{{ 3 = ( sqrt(3) )^2 }}}
{{{ ( sqrt(3) )^2*( x+3 )^2 = 36 }}}
{{{ ( sqrt(3) *( x+3 ))^2 = 36 }}}
Take the square root of both sides
(1) {{{ sqrt(3)*( x + 3 ) = 6 }}}
{{{ x + 3 = 2*( 3/sqrt(3) ) }}}
{{{ x = 3 = 2*sqrt(3) }}}
{{{ x = -3 + 2*sqrt(3) }}}
---------------------
Now go back to (1) and take the negative square root 
of the right side
(1) {{{ sqrt(3)*( x + 3 ) = -6 }}}
{{{ x + 3 = -2*( 3/sqrt(3) ) }}}
{{{ x = -3 - 2*sqrt(3) }}}
---------------------
You can plug both these results back into
the original problem