rational expresions are the equivalent of fractions. factoring both the numerator and the denominator lets you see and cancel like terms as long as nothing in the problem creates a division by zero error. this is true for real terms as well imaginary terms.
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Division by a factor that can be zero.
The expression (12x + 36)/48x can be simplified by factoring out 12/12 from the expressions. This leaves (x + 3)/4x.
a rational function.
Yes. Rational functions must contain rational expressions in order to be rational.
Sometimes :)