# Chapter 10 - Section 10.1 - Adding and Subtracting Polynomials - Exercise Set - Page 704: 18

12$x^{3}$-10$x^{2}$+15x

#### Work Step by Step

(11$x^{3}$+15x-9)-(-$x^{3}$+10$x^{2}$-9) =11$x^{3}$+15x-9+$x^{3}$-10$x^{2}$+9 =11$x^{3}$+$x^{3}$-10$x^{2}$+15x-9+9 =12$x^{3}$-10$x^{2}$+15x

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