7-16 Find the absolute maximum and minimum values of $f$ on the given closed interval, and state where those values occur. 10. $f(x)=2 X^{3}+3 x^{2}-12 x ;(-3,2]$ 11. $f(x)=\frac{3 x}{\sqrt{4 x^{2}+1}} ;[-1,1]$ 14. $f(x)=\sin x-\cos x ;[0, \pi]$ 15. $f(x)=1+\left|9-x^{2} ight|:(-5,1]$CS.SD. 129