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Aleks04 [339]
3 years ago
8

What does the denominator of a rational exponent represent

Mathematics
2 answers:
Daniel [21]3 years ago
7 0

The denominator of a rational exponent represents a root.

For example, the exponent \frac{1}{2} represents a square root. Likewise, an exponent of \frac{1}{3} represents a cube root.

_____

You can understand this if you recall what a root means, and what the rules of exponents are. A square root multiplied by itself gives the original value. Consider ...

\displaystyle\left(x^{\frac{1}{2}}\right)\left(x^{\frac{1}{2}}\right)=x^{\left(\frac{1}{2}+\frac{1}{2}\right)}\\\\=x^{1}=x

For other denominator values, the number of factors that must be multiplied to get x is the number in the denominator—just as you expect for a root.

Lunna [17]3 years ago
6 0

So here's the rule from fractional exponents to radicals: x^{\frac{m}{n}}=\sqrt[n]{x^m}

<u>Looking at this rule, the denominator represents the root.</u>

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