Chapter 7 Rational Functions - College of the Redwoods
Chapter 7 Rational Functions - College of the Redwoods
Chapter 7 Rational Functions - College of the Redwoods
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Section 7.5 Sums and Differences <strong>of</strong> <strong>Rational</strong> <strong>Functions</strong> 691<br />
7.5 Exercises<br />
In Exercises 1-16, add or subtract <strong>the</strong><br />
rational expressions, as indicated, and<br />
simplify your answer. State all restrictions.<br />
1.<br />
2.<br />
3.<br />
4.<br />
5.<br />
6.<br />
7.<br />
7x 2 − 49x<br />
x − 6<br />
2x 2 − 110<br />
x − 7<br />
27x − 9x 2<br />
x + 3<br />
2x 2 − 28<br />
x + 2<br />
+ 42<br />
x − 6<br />
− 12<br />
7 − x<br />
+ 162<br />
x + 3<br />
− 10x<br />
x + 2<br />
4x 2 − 8<br />
x − 4 + 56<br />
4 − x<br />
4x 2 36x − 56<br />
−<br />
x − 2 x − 2<br />
9x 2 72x − 63<br />
+<br />
x − 1 1 − x<br />
14.<br />
15.<br />
16.<br />
9x 2 144x − 576<br />
+<br />
x − 8 8 − x<br />
3x 2 − 12<br />
x − 3<br />
+ 15<br />
3 − x<br />
7x 2 112x − 441<br />
−<br />
x − 9 x − 9<br />
In Exercises 17-34, add or subtract <strong>the</strong><br />
rational expressions, as indicated, and<br />
simplify your answer. State all restrictions.<br />
17.<br />
18.<br />
19.<br />
20.<br />
3x<br />
x 2 − 6x + 5 + 15<br />
x 2 − 14x + 45<br />
7x<br />
x 2 − 4x + 28<br />
x 2 − 12x + 32<br />
9x<br />
x 2 + 4x − 12 − 54<br />
x 2 + 20x + 84<br />
9x<br />
x 2 − 25 − 45<br />
x 2 + 20x + 75<br />
8.<br />
5x 2 + 30<br />
x − 6<br />
− 35x<br />
x − 6<br />
21.<br />
5x<br />
x 2 − 21x + 98 − 35<br />
7x − x 2<br />
9.<br />
4x 2 − 60x<br />
x − 7<br />
+ 224<br />
x − 7<br />
22.<br />
7x<br />
7x − x 2 + 147<br />
x 2 + 7x − 98<br />
10.<br />
3x 2 63 − 30x<br />
−<br />
x − 7 7 − x<br />
23.<br />
−7x<br />
x 2 − 8x + 15 − 35<br />
x 2 − 12x + 35<br />
11.<br />
12.<br />
13.<br />
3x 2 48 − 30x<br />
−<br />
x − 2 2 − x<br />
4x 2 − 164<br />
x − 6<br />
− 20<br />
6 − x<br />
9x 2 81x − 126<br />
−<br />
x − 2 x − 2<br />
24.<br />
25.<br />
26.<br />
−6x<br />
x 2 + 2x + 12<br />
x 2 + 6x + 8<br />
−9x<br />
x 2 − 12x + 32 − 36<br />
x 2 − 4x<br />
5x<br />
x 2 − 12x + 32 − 20<br />
4x − x 2<br />
15<br />
Copyrighted material. See: http://msenux.redwoods.edu/IntAlgText/<br />
Version: Fall 2007