Question

Evaluate the product without directly multiply 198 x 209

Answer 1

Hey!
By inserting formulae
$(198 + 209) \div 2 = 203.5$
$(203.5 + 5.5)(203.5 - 5.5) \\ => {(203.5)}^{2} - {(5.5)}^{2} \\ => 41382$

This is the answer
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