Algebra Demystified 2nd Ed

380 alGEbra De mystif ieD

7.^2
21

334

3

32 1

32 1 2

21

3

x

xx

x

x

xx

xx x

x

x

+

−=−− =+

+⋅

+

−

LCD()

() (()^332 ()21 1 34

3

x

x

xx x

x

+⋅=+⋅−−

32 xx()−+ 32 ()()xx 13 =+ 21 ()−− 34 x

69 xx^2 −+() 21 =− 661 xx^2 −− 14

61 xx^22 −− 89 =− −− 61 xx 14

++ 6114 ++ 61 ++ 14

12

22

2

xx xx

x −−−=

+−=

+= −=

750

12 510

12 50 10

x

xx

xx

()()

−− ++

=− =

55 11

12 51

xx

x=−^5

12

8.^2
5

1

3

8

315

2

5

1

3

8

xxx

xx

−

+=−

+

−

Denominatorfactored: +=−

335

355

355 2

5

35

()

LCD()( )

()() (

x

xx x

xx x

x

xx

+

=−+

−+⋅

−

+−))(x )

x

+⋅ 5 1

3

=−+⋅−

+

355 8

35

3

xx x

x

xx

()()

()

( +++−+=−−

++−+

52 55 58

6555

)( )( )()( )

()()()

xx xx

xx xx==− −

++−=−+

85

63025840

7

222

xx

xxxxx

x

()

222

2

30 25 840

8408

+−=− +

+− +

xxx

xx x^22

2

2

2

40

15 10 25 0

1

5

15 10 25 1

5

0

32

−

−−=

−−=

−−

x

xx

xx

xx

()()

550

35 10

35010

=

−+=

−= +=

()()

xx

xx

++ −−

==−

=

55 11

35 xx 1

x^55

3