“It’s impossible,” Rina whispered.
(x + 2)(x + 3) = 0.
“Ready?” Bu Wati asked.
Problem 8: x² - 4x - 12 = 0 . Multiply to -12, add to -4? -6 and +2. (x - 6)(x + 2) = 0 → x = 6, x = -2.