$$2x^2+ 6x +2 .$$
Work Step by Step
We simplify by removing the parentheses and then add the like terms as follows: $$ (3x^2+ 4x + 7) - (x^2 - 2x + 5)\\ =3x^2+ 4x + 7 - x^2 + 2x - 5\\ =2x^2+ 6x +2 .$$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.