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Question 182
What will be the resultant if the square of 109 is subtracted from the square of 210 ?
Solution
$$a^{2}$$ - $$b^{2}$$ = (a+b)(a-b)
$$210^{2}$$ - $$109^{2}$$ = (210+109)(210-109)
=(319)(101)
=(319)(100+1)
=31900+319
32219
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