-5x^3 + 6x - 4 - 2x^3 + x combine like terms -7x^3 + 7x - 4

( -5x^3 + 6x - 4) + ( -2x^3 + x) You add -5x^3 and -2^3 -7x ^3 +6x + x -4 Add 6x and x -7x^3 + 7x - 4