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x² - 16 = 0
(x + 4)(x - 4) = 0
Akar-akarnya x = - 4 dan x = 4
[b]
2x² + 9x + 7 = 0 ⇒ 2 x 7 = 14 dan 2 + 7 = 9
2x² + 2x + 7x + 7 = 0
2x(x + 1) + 7(x + 1) = 0
(2x + 7)(x + 1) = 0
Akar-akarnya x = - 7/2 dan x = - 1