subtract 6x^2-5x+3 from (3x^2+8x-4)
3x^2 + 8x - 4 - (6x^2 - 5x + 3)....distribute thru the parenthesis3x^2 + 8x - 4 - 6x^2 + 5x - 3 .....combine like terms-3x^2 + 13x - 7 <==
