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28-03-2017
Mathematics

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Factor the polynomial by grouping 7x2+16x-15

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28-03-2017

16x can be broken down into factors of -105.
21 and -5 come to mind.

7x² + 21x - 5x - 15
7x(x + 3) - 5(x + 3)
(7x - 5)(x + 3) is the factorised form.

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