Sinurda5Ka3winnielle Sinurda5Ka3winnielle

08-07-2016
Mathematics

contestada

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

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HomertheGenius HomertheGenius

14-07-2016

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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