rumus abc : x²-9x+14=0

Metode ABC
x² - 9x + 14 = 0
a = 1, b = -9, c = 14

maka 
D = b² - 4ac = (-9)² - 4(1)(14) = 81 - 56 = 25

Sehingga

x1 = (-b + √D)/2a = (-(-9) + √25)/2(1) = (9 + 5)/2 = 7

dan

x2 = (-b - √D)/2a = (-(-9) - √25)/2(1) = (9 - 5)/2 = 2

Jadi, x = 2 atau x = 7


Terimakasih semoga membantu