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\frac{-12-\sqrt{144-4\times 1\left(-32\right)}}{2\times 1}
Calculate 12 to the power of 2 and get 144.
\frac{-12-\sqrt{144-4\left(-32\right)}}{2\times 1}
Multiply 4 and 1 to get 4.
\frac{-12-\sqrt{144-\left(-128\right)}}{2\times 1}
Multiply 4 and -32 to get -128.
\frac{-12-\sqrt{144+128}}{2\times 1}
The opposite of -128 is 128.
\frac{-12-\sqrt{272}}{2\times 1}
Add 144 and 128 to get 272.
\frac{-12-4\sqrt{17}}{2\times 1}
Factor 272=4^{2}\times 17. Rewrite the square root of the product \sqrt{4^{2}\times 17} as the product of square roots \sqrt{4^{2}}\sqrt{17}. Take the square root of 4^{2}.
\frac{-12-4\sqrt{17}}{2}
Multiply 2 and 1 to get 2.