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5 = 1 x 5, 21 = 3 x 7

3 x 5 = 15, 1 x 7 = 7, 15 - 7 = 8 so:

(5x + 7)(x - 3)

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11y ago
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11y ago

It is: 2a(2b+c)

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10y ago

(2a - 5b)(5a - b)

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14y ago

a(5+b)

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