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It is true that a rational function is a function whose equation contains a rational expression. This is used in various math classes.

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Q: True or false a rational function is a function whose equation contains a rational expression?

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Yes.

rational expression

If the simplified form of an expression contains an irrational number and a numerical evaluation is required then it is necessary to use a rational approximation.

You can multiply both sides by the LCD because as a rule, you can do anything to one side of an equation as long as you do the same thing to the other side. But when you simplify a rational EXPRESSION, you don't have an EQUATION. So there is no other side. So you can't multiply both sides by anything. You can, however, multiply both the numerator and the denominator by the same term (except zero).

I can see no rational expression below.

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Yes. Rational functions must contain rational expressions in order to be rational.

Yes. Rational functions must contain rational expressions in order to be rational.

Yes. Rational functions must contain rational expressions in order to be rational.

No, it is an expression, not an equation.

Yes. Rational functions must contain rational expressions in order to be rational.

rational expression