b = 5 b = 5, so b² = 5² 5² - 4 5² - 4 • a 5² - 4 • (-3) 5² - 4 • (-3) • c 5² - 4 • (-3) • (-4) c is this whole thing, I have to be careful. c is negative 4, we have to make sure we take the sign into consideration, so times c, which is negative 4 over here.