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.... x .... = 30
..... + ... = 17
faktor yg memenuhi → 2 & 15
-6x² + 17x - 5
=> -6x² + 2x + 15x - 5
=> -(6x² + 2x) + (15x - 5)
=> (-6x² - 2x) + (15x - 5)
=> -2x (3x - 1) + 5 (3x - 1)
==> (-2x + 5) (3x - 1)
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