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This will only give a rational answer when it's +56. Then you're looking for two numbers that add to 15 and multiply to 56. That's 7 and 8.

If it's -15x, the answer is (x - 8)(x - 7)

If it's +15x, the answer is (x + 8)(x + 7)

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12y ago

What else can I help you with?