Quadratic function the written enforced form. the roots of the quadratic function will make the factor equal to zero.
1) roots x=-1 and x =5
2) foots x=1 and x=5
3) neither

1) n(x)= (3x+15)(x-1)
2) f(x) = (x-1) ( x+5)
3) k(x)= (x+1)(x-5)
4) h(x) = 1/2(x+1) (2x-20)
5) q(x) = (2x-2)(3x+15)
6) m(x) = 1/2(x+1)(2x-10)