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x² - 4x - 12 = 0
a) pemfaktoran
x² - 4x - 12 = 0
(x - 6) (x + 2) = 0
x = 6 atau x = -2
b) melengkapkan kuadrat sempurna
x² - 4x - 12 = 0
x² - 4x = 12
x² - 4x + 4 = 12 + 4
(x - 2)² = 16 --> kedua ruas diakar
x - 2 = 4
x = 6
atau
x - 2 = -4
x = -2
c) rumus abc
semoga membantu ya :)