501*501, Evaluate the given product without actual multiplication.
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Solution :
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We know the algebraic identity ,
( a + b )² = a² + 2ab + b²
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501 × 501
= ( 500 + 1 )( 500 + 1 )
= ( 500 + 1 )²
= ( 500 )² + 2 × 500 × 1 + 1²
= 250000 + 1000 + 1
= 251001
Therefore ,
501 × 501 = 251001
••••
*****************************************
We know the algebraic identity ,
( a + b )² = a² + 2ab + b²
*****************************************
501 × 501
= ( 500 + 1 )( 500 + 1 )
= ( 500 + 1 )²
= ( 500 )² + 2 × 500 × 1 + 1²
= 250000 + 1000 + 1
= 251001
Therefore ,
501 × 501 = 251001
••••
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