Question 182

What will be the resultant if the square of 109 is subtracted from the square of 210 ?

Solution
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$$a^{2}$$ - $$b^{2}$$ = (a+b)(a-b)

$$210^{2}$$ - $$109^{2}$$ = (210+109)(210-109)

=(319)(101)

=(319)(100+1)

=31900+319

32219

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