What should be added to \[1+2x-3{{x}^{2}}\]to get\[{{x}^{2}}-x-1?\]

1.	What should be added to \[1+2x-3{{x}^{2}}\]to get\[{{x}^{2}}-x-1?\]
A.	\[~2{{x}^{2}}-\text{ }x+2\]
B.	\[~4{{x}^{2}}-3x-2\]
C.	\[{{x}^{2}}-3x-2\]
D.	\[2{{x}^{2}}-3x-2\]
Answer» C. \[{{x}^{2}}-3x-2\]

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What should be added to \[1+2x-3{{x}^{2}}\]to get\[{{x}^{2}}-x-1?\]

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