Find the Absolute Maximum and Absolute Minimum of each function over the given intervals

$4.)f(x)=x^3+3x^2-2$ on $-3,2$

$5.)f(x)=2x^3-3x^2-12x+4$ on $-2,3$

$6.)f(x)=x^4-2x^2+1$ on $-1,2$