Diketahui fungsi kuadrat x² -9x + 20=6

x²-9x+20 = 6
x²-9x+14 = 0
(x-2)(x-7) = 0
x-2 = 0 atau x-7 = 0
x = 2 atau x = 7

x^2-9x+20=6
x^2-9x+20-6=0
x^2-9x+14=0
(x-7)(x-2)=0
x=7 atau x=2