Evaluate
-7.8
Factor
-7.8
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2\times 1.1-\left(\sqrt{10}\right)^{2}
Calculate the square root of 1.21 and get 1.1.
2.2-\left(\sqrt{10}\right)^{2}
Multiply 2 and 1.1 to get 2.2.
2.2-10
The square of \sqrt{10} is 10.
-7.8
Subtract 10 from 2.2 to get -7.8.
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