6. Which of the following binomial is a factor of Px=x3-x2-5x-3 ？ A. x+1 B. x+2 C. x-3 D. x-2 7.if Px=x3+4x2+3x-2 , what will be the value Px at x=3 ? A. -70 B. 70 C.50 D.-5