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Elementary and Intermediate Algebra
Mark Dugopolski, Southeastern Louisiana University

Rational Expressions
Addition and Subtraction

Warm-Ups



1

1/2 + 1/3 = 2/5
A)TRUE
B)FALSE
2

7/12 - 1/12 = 1/2
A)TRUE
B)FALSE
3

3/5 + 4/3 = 29/15
A)TRUE
B)FALSE
4

4/5 - 5/7 = 3/35
A)TRUE
B)FALSE
5

5/20 + 3/4 = 1
A)TRUE
B)FALSE
6

2/x + 1 = 3/x for any nonzero value of x.
A)TRUE
B)FALSE
7

1 + 1/a = (a + 1)/a for any nonzero value of a.
A)TRUE
B)FALSE
8

a - 1/4 = (3/4)a for any value of a.
A)TRUE
B)FALSE
9

a/2 + b/3 = (3a + 2b)/6 for any values of a and b.
A)TRUE
B)FALSE
10

The LCD for the rational expressions 1/x and 3x/(x - 1) is x2 - 1.
A)TRUE
B)FALSE