Perfect square of trinomial
asked Jun 19, 2017 in Other Math Topics by Roxanne
reshown Jun 19, 2017 by Rod

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1 Answer

First guess the square root from the first and last terms and sign of the middle term: 20xy-3z. Now check out the middle term coefficient. It should be 2*20*3=120. It is, so the expression is (20xy-3z)^2.

answered Jun 19, 2017 by Rod Top Rated User (538,080 points)

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