Algebraic Fractions

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http://www.youtube.com/watch?v=DQKL7bh2nO4 (Enclavar)

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SAME DENOMINATOR

1 + 3 = 1+3

8 8 8

= 4

8

= 1

2

DIFFERENT DENOMINATORS

1 + 3 = crosss multiply

7 2

= 1 x 2 + 3 x 2

7 x 2

= 2 + 21

14

= 23

14

x + 2a = cross multiply

3a 5x

= 5x^2 + 6a

15ax

2c + 3c = 2c + 3a

a a a

= 5c

a

Adding

Multiplying