Question

sum of 2x2-x+1 and -x2+x-2​

Answer 1

$2x {}^{2} - x + 1 + (- x {}^{2} + x - 2) \\ \\ = 2x {}^{2} - x + 1 - x {}^{2} + x - 2 \\ \\ = x {}^{2} - 1$

I hope this helps.