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What should be added to 2x^2+3x-5 to x^2...

What should be added to `2x^2+3x-5` to `x^2+x+1` ? ` x^2-4x+6` (b) `x^2-4x+6` (c) `x^2-4x+6` (d) `x^2-4x+6`

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