172 algebra De mystif ieD
6
212
436
112(^2213)
x
xxxx
x
++ xx xx
−
++
++
−
()()()++()
= 6
1
3
3
2
13
1
1
632
2
x
x
x
xxx
x
x
xx x
() ()()
()(
- ⋅ +
−
++
⋅ +
= +− +^11
132
)
()xx++()
=^61822
13
6162
12 3
22
2
xxx
xx
xx
xx
+−−
++
= +−
()()()++()
6 1
25
6
1
1
25
6
1
25
25
1
25
62 51
2
=+
=⋅+
= ++
xx
x
xx
x
x
()
55
12 30 1
25
12 31
25
= ++
= +
x
x
x
x
3
45
2
5
3
51
2
5
3
xx^251
x
xxx
x
+− xxx
- −
=
+−
- −
=
+−
()() ()()
xx
x
x
x
−
⋅ −
−
2
5
1
1
= 321
51
332
51
+− −^223
+−
= +−+
+−
()() = −
()()()()
xx
xx
xx
xx
x xx
xx
+−
5
() 51 ()
PRACTICE
Rewrite each fraction so that they have the same denominator, and then
find the sum or difference.
1.^1
56
1
xx xx^22 ++ 23+
+−=2.^5
2512
2
xx^2312x
−− x+
−=3.^1
20
2
xx^22 +− xx 12−
+−=4.^1
62430
5
xx^22 +− 22 xx 60+
−−=5.^2
4
1
2323
xx^22 − xx 212 08 x+
−−
++=- 1 23
4
− −
+x =
x7.^1
3
1
xx−^223 x+
−−=PRACTICE
Rewrite each fraction so that they have the same denominator, and then