Evaluate
-\frac{20\sqrt{1806}}{903}\approx -0.941241611
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\frac{-40}{\sqrt{1806}}
To multiply \sqrt{21} and \sqrt{86}, multiply the numbers under the square root.
\frac{-40\sqrt{1806}}{\left(\sqrt{1806}\right)^{2}}
Rationalize the denominator of \frac{-40}{\sqrt{1806}} by multiplying numerator and denominator by \sqrt{1806}.
\frac{-40\sqrt{1806}}{1806}
The square of \sqrt{1806} is 1806.
-\frac{20}{903}\sqrt{1806}
Divide -40\sqrt{1806} by 1806 to get -\frac{20}{903}\sqrt{1806}.
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