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\left(2\sqrt{7}\right)^{2}-5^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
2^{2}\left(\sqrt{7}\right)^{2}-5^{2}
Expand \left(2\sqrt{7}\right)^{2}.
4\left(\sqrt{7}\right)^{2}-5^{2}
Calculate 2 to the power of 2 and get 4.
4\times 7-5^{2}
The square of \sqrt{7} is 7.
28-5^{2}
Multiply 4 and 7 to get 28.
28-25
Calculate 5 to the power of 2 and get 25.
3
Subtract 25 from 28 to get 3.