1. Determine which of the following equations are quadratic. Put a check mark in the box, if it is quadratic; and a cross X mark, if otherwise. 1) 2) 3) 4) 6x2 + 11x - 35 = 0 X + 11x - 35 = 0 5x = 0 x=4 4x² - 7x = 12 6) 7) 8) 9) 10) Ox2 = 1 2x2 - 64 = 0 -2x² - 4 = 6 -6x2 = - 3x 5x + 3x =0 5)​