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

User Aja
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1 Answer

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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 )
User Shujito
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