You can put this solution on YOUR website! (3x^2-2x+5)-(2x^2-5x+1) the signal negative change all the signals of the parentheses
3x^2 - 2x + 5 - 2x^2 + 5x -1
3x^2 - 2x^2 - 2x + 5x + 5 -1 calculing x^2 with x^2, x with x and single numbers
x^2 + 3x + 4