◆ QUADRATIC EQUATIONS ◆
[tex]given \: expression \: - \\ \\ y = {x}^{2} - 16x + 63 \\ \\ y = {x}^{2} - 7x - 9x + 63 \\ \\ y = x(x - 7) - 9(x - 7) \\ \\ y = (x - 9)(x - 7) \: \: \: \: \: \: ans. \\ \\ \\ additional \: calculation \: - \\ \\ had \: been \: \: y = 0 \\ \\ we \: would \: have \: got \: \\ x = 9 \: \: \: \: \: or \: \: \: \: \: x = 7[/tex]
