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\frac{-1-\sqrt{-4-4\times 1\left(-3\right)}}{2.1}
Calculate 2 to the power of 2 and get 4.
\frac{-1-\sqrt{-4-4\left(-3\right)}}{2.1}
Multiply 4 and 1 to get 4.
\frac{-1-\sqrt{-4-\left(-12\right)}}{2.1}
Multiply 4 and -3 to get -12.
\frac{-1-\sqrt{-4+12}}{2.1}
The opposite of -12 is 12.
\frac{-1-\sqrt{8}}{2.1}
Add -4 and 12 to get 8.
\frac{-1-2\sqrt{2}}{2.1}
Factor 8=2^{2}\times 2. Rewrite the square root of the product \sqrt{2^{2}\times 2} as the product of square roots \sqrt{2^{2}}\sqrt{2}. Take the square root of 2^{2}.