Let's solve your equation step-by-step.
Step 1: Flip the equation.
Step 2: Solve Square Root.
3x=(x−6)2(Square both sides)
3x−(x2−12x+36)=x2−12x+36−(x2−12x+36)(Subtract x^2-12x+36 from both sides)
(−x+3)(x−12)=0(Factor left side of equation)
−x+3=0 or x−12=0(Set factors equal to 0)
x=3 or x=12
Check answers. (Plug them in to make sure they work.)
x=3(Doesn't work in original equation)
x=12(Works in original equation)