225×225-175 question from identies
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(a+b)square = a square + b square + 2ab
it's 225*225 - 175 square
= 225 square - 175 square
= ( 200+25 ) square - (200 - 25) square
= (200 square + 25 square + 2*200*25) - (200 square + 25 square - 2*200*25)
= 200 square + 25 square + 2*200*25 - 200 square - 25 square +2*200*25)
= +2*200*25 +2*200*25 = 20000
it's 225*225 - 175 square
= 225 square - 175 square
= ( 200+25 ) square - (200 - 25) square
= (200 square + 25 square + 2*200*25) - (200 square + 25 square - 2*200*25)
= 200 square + 25 square + 2*200*25 - 200 square - 25 square +2*200*25)
= +2*200*25 +2*200*25 = 20000
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