## Chapter 5, Lesson 5

**5-5.A** understand the definition of subtraction**Which is equivalent to the expression —5 x—(—7x)?**

**(a)**—12

*x*

**(b)**—2

*x*

**(c)**2

*x*

**(d)**12

*x*

**5-5.B** recognize opposites**Which are not opposites?**

**(a)** 19, —19 **(b)**

**(c)** 4*x*, —4*x* **(d)** 2*x*^{4}, —4*x*^{2}

**5-5.C** add polynomials

**Write each sum in standard form.**

**a.** (*y*^{3} + 4*y* + 7) + (12*y*^{2} — 4*y* — 2)

**b.** (—3 + 9*g* + *g*^{2} + 3*g*^{3}) + (10*g*^{2} — *g* — 9)