Chapter 5 - Exponents and Polynomials - 5.1 - Addition and Subtraction of Polynomials - Problem Set 5.1 - Page 195: 58

-5$x^{2}$ + 2x -6

(-3$x^{2}$ - 2) + (7$x^{2}$ - 8) - (9$x^{2}$ - 2x - 4) = Use the distributive property: -3$x^{2}$ - 2 + 7$x^{2}$ - 8 - 9$x^{2}$ + 2x + 4 = Group similar terms. (-3$x^{2}$ + 7$x^{2}$ - 9$x^{2}$) + (2x) + (-2 - 8 + 4) = Simplify -5$x^{2}$ + 2x -6