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\left(10\sqrt{2}\right)^{2}-14^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
10^{2}\left(\sqrt{2}\right)^{2}-14^{2}
Expand \left(10\sqrt{2}\right)^{2}.
100\left(\sqrt{2}\right)^{2}-14^{2}
Calculate 10 to the power of 2 and get 100.
100\times 2-14^{2}
The square of \sqrt{2} is 2.
200-14^{2}
Multiply 100 and 2 to get 200.
200-196
Calculate 14 to the power of 2 and get 196.
4
Subtract 196 from 200 to get 4.