$2x^2 - 4x+6$
Work Step by Step
We simplify by removing the parentheses and then combine the like terms as follows $$ (x^2 - x + 2) + (2x^2 - 3x + 5) - (x^2 + 1)=x^2 - x + 2+ 2x^2 - 3x + 5 - x^2 -1\\ = 2x^2 - 4x+6 .$$
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