Evaluate
-2\sqrt{15}-16\approx -23.745966692
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-1-\sqrt{15}-\sqrt{15}-\left(\sqrt{15}\right)^{2}
Apply the distributive property by multiplying each term of -1-\sqrt{15} by each term of 1+\sqrt{15}.
-1-2\sqrt{15}-\left(\sqrt{15}\right)^{2}
Combine -\sqrt{15} and -\sqrt{15} to get -2\sqrt{15}.
-1-2\sqrt{15}-15
The square of \sqrt{15} is 15.
-16-2\sqrt{15}
Subtract 15 from -1 to get -16.
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