8.1 Review Worksheet, Part 1 (continued)
Solve. Check your solution. 26. x x x 3 10 8 2 2 2 + + − − = −
x x x x 3 28 ( 7)( 4) 2 + − + −
2 − −
x
9
27.
28.
11
5
= −
=
x
3
8.1.3 Adding and Subtracting Rational Expressions Add or subtract. Identify any x -values for which the expression is undefined. 29. x x x x 2 3 4 7 2 3 4 7 − − + − − 30. x x x x 5 3 4 3 5 3 4 − + − − + 31. x x 3 2 7 2 − +
x x 2 5 2 7 − +
−
Find the least common multiple for each pair. 32. 12 x 2 y 3 and 14 x 3 y 2
33. 16 x 2 − 25 and 4 x 2 − x − 5
Add or subtract. Identify any x -values for which the expression is undefined. 34. x x x x 3 2 2 2 4 1 − + + − 35. x x x x 2 7 2 8 3 6 − − + − 36. x x x 5 4 7 1 2 + +
37. x x 2
x 2 3 3 x − −
38. x x
x 2 1 2 3 x + −
4 3 9 − −
1 −
2 6 8
39.
−
−
−
x
4
2 3 +
x x 2
− +
199
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