Evaluate
-28
Factor
-28
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-2^{2}\left(\sqrt{7}\right)^{2}
Expand \left(2\sqrt{7}\right)^{2}.
-4\left(\sqrt{7}\right)^{2}
Calculate 2 to the power of 2 and get 4.
-4\times 7
The square of \sqrt{7} is 7.
-28
Multiply 4 and 7 to get 28.
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