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4x + 8y
4(x + 2y)
Yang B
x² + 4x - 12→ 1 x 12
12
1 x 12
2 x 6
x² + 4x - 12
x² - 2x + 6x - 12
x(x - 2) + 6(x - 2)
(x + 6)(x - 2)
x + 6 = 0 atau x - 2 = 0
x = - 6 x = 2
Yang C
4x² - 8x - 5 → 4 x 5
20
1 x 20
2 x 10
4x² - 8x - 5
4x² + 2x - 10x - 5
2x(2x + 1) - 5(2x - 1)
(2x - 5)(2x + 1)
2x - 5 = 0 atau 2x + 1 = 0
2x = 5 2x = - 1
x = 5/2 x = -1/2