Write in the standard form quadratic equation x^2 - 19x + 64 = 0. Calculate the discriminant d = b^2 - 4ac = (-19)^2 - 4*1*64 = 361 - 256 = 105. Find the roots using the quadratic formula= = . ANSWER. There are two roots , (separated by comma - one comma is just enough to separate two roots).