D Question 1 1 pts Which of the facts/claims were used in the proof of Theorem 1.1.1 (Quadratic Formula Theorem). Choose all that apply. O Multiplying/dividing an equation by a nonzero number does not change its solution set. O For any real x, y we have x2 - y' = (x - y)(x + y). O For any real x, y we have that (x + y) = x2 + 2xy + 12. ( For all real x and y, xy = 0 if and only if x = 0 or y = 0. O For any real x, x- > 0.Theorem 1.1.1 (The Quadratic Formula). Let a, b, c be three real numbers, with a * 0. Then the equation ax2 + bx + c=0 has. .. (a) No real solutions if b2 - 4ac 0, given by x = -b+ vb2 - 4ac and c = 2a 2a