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P6(b) Adding & Subtracting Rational
ExpressionsHomework: p. 86-87 33-71 odd
Quiz tomorrow!…Not spending class time to go over your homework…questions must
be answered before school!
Adding and subtracting rational expressions: Just like simple fractions, the denominators must match before you can add or subtract.
Finding the LCD: 1. Factor each denominator
completely.2. List one of every unique factor, to
the highest exponent that it occurs.3. Multiply existing fractions by the
“missing” factors.
Find the LCD:
Now, let’s add some math operations…
2 2
7 9 and
5 15 6 9x x x x
2 2
3 2 and
2 1
x
x x x
2 2
3 2
2 1
x
x x x
Guided Practice:
Now for some complex rational expressions – hint : the numerator and the denominator must be managed separately first, then the fraction as a whole…
8 21.
2 3x x
11
1. 1
1
x
x
1 322.
1 34
x
x
Whiteboard Practice:
3 2 3 61.
3 4 3 4
x x
x x
4 32.
3x x
3 43.
3 2
x x
x x
144.
4
x
x