Verified answer

I am assuming that X2 is really x².

Remove the parentheses, and group terms of the same order:

(x² – x + 7) + (x² + 3x + 1), simplifies to:

2x² + 2x + 8, or

2(x² + x + 4)

2x2+2x+8

Remove the parentheses and combine like terms . . . is how to do it.