distick0308 distick0308

02-03-2016
Mathematics

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what adds to be 10 but multiplies to be -171

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xoxonikki xoxonikki

03-03-2016

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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