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28 November, 02:09

What polynomial identity should be used to prove that 252 = (20 5) 2?

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  1. 28 November, 02:18
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    25² = (20 + 5) ² This is the square of a binomial:

    (a + b) ² = a² + 2 a b + b²

    625 = 20² + 2 · 20 · 5 + 5²

    625 = 400 + 200 + 25

    625 = 625 (correct)
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