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13 January, 10:50

What adds to be 10 but multiplies to be - 171

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  1. 13 January, 13:50
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    The usual pattern is (x + a) * (x + b) = x^2 + (a + b) x + ab and the special case (x + a) * (x - a) = x^2 - a^2. When you recognize the pattern you can just write the answer from memory.
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