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12 May, 02:08

5x^2 - 15x-140 what method should be use?

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  1. 12 May, 02:36
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    5x^2 - 15x-140

    5 (x² - (3x) - 28)

    5 (x² + (4x-7x) - 28)

    5 (x (x+4) - 7 (x+4)

    5 (x-7) * (x-4)
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