# Chapter 5 - Section 5.5 - Multiplying Polynomials - Exercise Set: 75

Add: $20a$ Subtract: $-10a$ Multiply: $75a^2$ Divide: $\frac{1}{3}$

#### Work Step by Step

Add: $5a+15a=20a$ Subtract: $5a-15a=-10a$ Multiply: $(5a)(15a)=75a^2$ Divide: $\frac{5a}{15a}=\frac{1}{3}$

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