Question

I need help with this

Answer 1

`x=9\to9\leq x < 13\\\\\text{therefore}\\\\f(9)=12`


`f(x)=\left\{\begin{array}{cccc}6x^2+2&if&-6 \ \textless \ x \ \textless \ 9\\12&if&9\leq x \ \textless \ 13&\leftarrow\text{here}\end{array}\right`
Answer: 12