Question

find the square of 49 by using (a+b)²​

Answer 1

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According to question :-

$= ( {49})^{2}$

$= ( {40 + 9})^{2}$

$( {x + y})^{2} = {x}^{2} + {y}^{2} + 2xy$

$= {(40)}^{2} + {(9)}^{2} + 2 \times 40 \times 9$

$= 1600 + 81 + 720$

$= 2401$

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