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383
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383
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20^{2}-\left(\sqrt{17}\right)^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
400-\left(\sqrt{17}\right)^{2}
Calculate 20 to the power of 2 and get 400.
400-17
The square of \sqrt{17} is 17.
383
Subtract 17 from 400 to get 383.
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