140 algebra De mystif ieD
4 21
34
121
34
13
321
3
43− +
+=−+
+=⋅+
+− +
+
= +−x
xx
xx
xx
x
()x ( 221
34122 1
3211
3x
xxx
xx
x+
+= +−−
+= +
+)x
xx
xx
xx
xx
xx
x
xx xx−−
+=
−⋅ +
+−
+⋅ −
−= +− −5252
225
5
() 25 ()
(()xx() ()()()()xxxx
xxx
+− xx= +−+
+−=
25 +−25
257
2522PRACTICE
Find the sum or difference.1.^7
23
4
xx+ 2+
−=2.^1
x 12
x
− x+
+=3.^34
5
x 2
x−
+−=- x
xy
y
23 + xy 4+
−=- x
x
x
63 + 63 x+
−=✔SOLUTIONS
- 237 42 237 22 42 2323
724xx xx
xxx
x
x++
−=
+⋅ −
−+
−⋅ +
+= ()−+(^223
22 37148 12
22 3
15 2x
xxxx
xx
x+
−+= −++
−+= −)
()()()()(xxx−+ 22 )( 3 )2.^1
12
1
12
221
112 1
xx
xxx
xx
xx
xxxx
−+
+=
−⋅ +
++
+⋅ −
−= ()++()−
(()()()()()()xx
xxx
xxx
xx+−= ++ −
+−= +
+−21
2
212
2122PRACTICE
Find the sum or difference.