4. Rational Expressions
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Write as a product of fractions
a* b/c=a/c* b
a^(- m)=1/a^m
1/x^(- n)=x^n
Multiply fractions
a/c* b = a* b/c
Write as a sum
a^(m+n)=a^m*a^n
a^1=a
Split into factors
Cancel out common factors
Simplify quotient
Multiply
Denominator | Restrictions on the denominator | Restrictions on the variables |
---|---|---|
5y^2 | 5y^2≠ 0 | y≠ 0 |
5x^(-5) | x^5≠ 0 | x≠ 0 |
5y^2* y | y^2≠ 0 and y≠0 | y≠ 0 and y≠ 0 |
2* 3x^3* x^2 | 3x^3≠ 0 and x^2≠ 0 | x≠ 0 and x≠ 0 |
2x^2 | 2x^2≠ 0 | x≠ 0 |
We found two restrictions on the variables. y≠ 0, x≠ 0