Penjelasan dengan langkah-langkah:
x² + 9x + 20 = 0
(x + 4)(x + 5) = 0
x = -4 atau x = -5
x² + 10x + 21 = 0
(x + 3)(x + 7) = 0
x = -3 atau x = -7
x² + 17x + 72 = 0
(x + 8)(x + 9) = 0
x = -8 atau x = -9
x² + 17x + 30 = 0
(x + 15)(x + 2) = 0
x = -15 atau x = -2
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Penjelasan dengan langkah-langkah:
x² + 9x + 20 = 0
(x + 4)(x + 5) = 0
x = -4 atau x = -5
x² + 10x + 21 = 0
(x + 3)(x + 7) = 0
x = -3 atau x = -7
x² + 17x + 72 = 0
(x + 8)(x + 9) = 0
x = -8 atau x = -9
x² + 17x + 30 = 0
(x + 15)(x + 2) = 0
x = -15 atau x = -2
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