help!!!我有數學唔識!!!

(1.) Solve 3(2x²-1)=3x(x+2) and leave your answer in surd form。
(2.) If K is a root of the quadratic equation 6x²+3kx-4=0，find the valies of K。
(3.) Solve (3x+4)²-6(3x+4)-72=0
(4.) Solve 3√x=2x+1
(5.) Solve √((x+1)(x+8)) +4 = 2x

(我要詳細的步驟)