Brandon solves x2+4x=9 by collecting all the terms on the left and making the right side equal to 0. When he uses the quadratic formula, what are his values for a, b, and c?

Question 1 options:

a = 0, b = 4, c = -9


a = 0, b = 4, c = 9


a = 1, b = 4, c = -9


a = 1, b = 4, c = 9