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(x + 7/2)² + 48/4 - 49/4 = 0
(x + 7/2)² = 1/4
x + 7/2 = plus minus √1/4
x + 7/2 = + - 1/2
x = 1/2 - 7/2 = -6/2 = - 3 atau x = - 1/2 - 7/2 = - 8/2 = -4
Jadi, persamaan x² + 7x + 12 = 0 dapat diubah bentuknya menjadi kuadrat sempurna yaitu x² + 7x + 49/4 = 1/4 ⇔ (x + 7/2)² = 1/4