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Factorise: (x - 8)( x + 15) = 0

x - 8 = 0 or x + 15 = 0, so x = 8 or -15

Check: 64 + 56 = 120 OK; 225 - 105 = 120 OK

Job done.

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Q: What X2 plus 7x minus 120 equals 0?
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