I got some questions for functions. Need some help

1)Solve for K if $\displaystyle f(x)=2k(3x+2), $and $\displaystyle f^-1(4)=6$

2) Describe the sequence of functions that will transform $\displaystyle f(x)=x^2$ into $\displaystyle g(x)=2x^2-12x+7$

I just need the step by step transformation