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5^{2}-\left(\sqrt{2}\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}.
25-\left(\sqrt{2}\right)^{2}
Calculate 5 to the power of 2 and get 25.
25-2
The square of \sqrt{2} is 2.
23
Subtract 2 from 25 to get 23.