(0 - (b * b)) + (4 * (a * c)) ==> let { t.3 = b * b } in let { t.2 = 0 - t.3 } in let { t.5 = a * c } in let { t.4 = 4 * t.5 } in let { t.1 = t.2 + t.4 } in t.1