. Which must be added to x2-2x/3 in order to be a perfect square is A.(4/2)^2 B. (2/3)^2 C. 32 D. (3/4)^2 E.(1/3)^2 A quadratic equation with roots -3 and 5 is A.x2-15=0 B. x2-8x-15=0 C.x2+8x-15=0 D.