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- Radicals and rational exponents
Simplifying rational exponents
Simplify:
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Key concepts
- The principal square root of a number
is the nonnegative number that when multiplied by itself equals
See
[link] .
- If
and
are nonnegative, the square root of the product
is equal to the product of the square roots of
and
See
[link] and
[link] .
- If
and
are nonnegative, the square root of the quotient
is equal to the quotient of the square roots of
and
See
[link] and
[link] .
- We can add and subtract radical expressions if they have the same radicand and the same index. See
[link] and
[link] .
- Radical expressions written in simplest form do not contain a radical in the denominator. To eliminate the square root radical from the denominator, multiply both the numerator and the denominator by the conjugate of the denominator. See
[link] and
[link] .
- The principal
n th root of
is the number with the same sign as
that when raised to the
n th power equals
These roots have the same properties as square roots.
See
[link] .
- Radicals can be rewritten as rational exponents and rational exponents can be rewritten as radicals. See
[link] and
[link] .
- The properties of exponents apply to rational exponents. See
[link] .
Section exercises
Verbal
What does it mean when a radical does not have an index? Is the expression equal to the radicand? Explain.
When there is no index, it is assumed to be 2 or the square root. The expression would only be equal to the radicand if the index were 1.
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Numeric
For the following exercises, simplify each expression.
Algebraic
For the following exercises, simplify each expression.
Real-world applications
A guy wire for a suspension bridge runs from the ground diagonally to the top of the closest pylon to make a triangle. We can use the Pythagorean Theorem to find the length of guy wire needed. The square of the distance between the wire on the ground and the pylon on the ground is 90,000 feet. The square of the height of the pylon is 160,000 feet. So the length of the guy wire can be found by evaluating
What is the length of the guy wire?
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Extensions
For the following exercises, simplify each expression.
Questions & Answers
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Source:
OpenStax, Algebra and trigonometry. OpenStax CNX. Nov 14, 2016 Download for free at https://legacy.cnx.org/content/col11758/1.6
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