Find the product. if the result is negative, enter "-". if the result is positive, enter "+".

-7(- a^2 )^2 ( -b^3 )

For which pairs of functions is (f•g)(x)=12x? f(x)=3-4x and g(x)=16x-3 f(x)=6x2 and g(x)= 2/x f(x)= and g(x) = 144x f(x)=4x and g(x) =3x