$f(x)=(2x-3)(x+6)(5x+6)$ has zeros at $x=-6,x=-\frac{6}{5},$ and $x=\frac{3}{2}.$

What is the sign of $f$ on the interval $fff-6?$

Choose $1$ answer:

$fis$ always positive $on$ the interval.

$fis$ always negative $on$ the interval.

$fis$ sometimes positive and sometimes negative $on$ the interval.