8xy - 20x =0 p² - 121 = 0 x² - 9x + 14 = 0
4x (2y - 5) = 0 (p - 11)(p + 11) = 0 (x - 2)(x - 7) = 0
4x = 0 V 2y - 5 = 0 p - 11 = 0 V p + 11 = 0 x - 2 = 0 V x - 7 = 0
x = 0 V 2y = 5 p = 11 V p = -11 x = 2 V x = 7
x = 0 V y = 2,5
Factor buiten Verschil van twee Product-som
haakjes kwadraten methode