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-28
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-28
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0\times 2\sqrt{10}-\sqrt{900}+2
Factor 40=2^{2}\times 10. Rewrite the square root of the product \sqrt{2^{2}\times 10} as the product of square roots \sqrt{2^{2}}\sqrt{10}. Take the square root of 2^{2}.
0\sqrt{10}-\sqrt{900}+2
Multiply 0 and 2 to get 0.
0-\sqrt{900}+2
Anything times zero gives zero.
0-30+2
Calculate the square root of 900 and get 30.
-30+2
Subtract 30 from 0 to get -30.
-28
Add -30 and 2 to get -28.
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