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MATH 1150 · Radical expressions · Objective 1.3

Power Rules with Rational Exponents

Apply powers to powers, products, and quotients.

CLO 1 · Topic 7 of 21
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Build the concept from the beginning

Meaning before procedure

A power of a power multiplies exponents: (a^r)^s = a^(rs). A power distributes to every factor in a product and to numerator and denominator factors in a quotient when defined.

Power of a power
Multiply the inner and outer exponents.
Power of a product
Apply the exponent to every factor.
Power of a quotient
Apply the exponent to numerator and denominator.
Grouping
Parentheses show the full expression affected by the outer power.

Interactive visual model

Compare a nested power with the product of its exponents.

Change one control at a time and describe what changes—and what stays invariant.

A dependable four-step method

Identify the complete powered group.
Distribute the outer exponent to every factor if needed.
Multiply nested exponents.
Simplify coefficients and rational exponents.
  1. Identify the complete powered group.
  2. Distribute the outer exponent to every factor if needed.
  3. Multiply nested exponents.
  4. Simplify coefficients and rational exponents.
Three fully explained examples

Watch the reasoning, not just the answer

Example 1: Simplify (x^(2/3))^(3/4).

Name the goalThis is a power of a power.
Choose the next moveMultiply 2/3 by 3/4.
Carry out the mathematics6/12 = 1/2, so x^(1/2).
Check and interpretSquaring the result gives x, matching the combined power.

Example 2: Simplify (a²b³)^(1/2).

Name the goalThe outer power affects both factors.
Choose the next moveDistribute 1/2 to each exponent.
Carry out the mathematicsa^(2·1/2)b^(3·1/2) = ab^(3/2), under the usual nonnegative-base assumptions.
Check and interpretSquaring ab^(3/2) returns a²b³.

Example 3: Simplify ((m^4)/(n²))^(1/2).

Name the goalThe outer exponent applies to numerator and denominator.
Choose the next moveMultiply each exponent by 1/2.
Carry out the mathematicsm²/n, under stated positive-variable assumptions.
Check and interpretSquaring m²/n returns m⁴/n².
Interactive practice

Predict, decide, check, and revise

Interactive construction lab

Build a valid reasoning path

Choose the decisions in the order a careful solver would use them for this concept.

Choose this step, then check the construction.
Choose this step, then check the construction.
Choose this step, then check the construction.

The reasoning path changes as each decision is selected.

Readiness check

Check the foundation

Simplify (x^(1/2))^(3/2).

Simplify (x^(2/3))^(3/4).

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Guided practice

Apply the method with support

Simplify (x^(3/4))^(2/3).

Simplify (x^(5/6))^(3/5).

Simplify (x^(7/8))^(4/7).

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Independent practice

Work without step prompts

Simplify (x^(2/5))^(5/3).

Simplify (x^(3/2))^(2/5).

Simplify (x^(4/3))^(3/8).

Simplify (x^(5/4))^(2/5).

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Mastery check

Demonstrate durable understanding

Simplify (x^(1/3))^(9/2).

Simplify (x^(7/6))^(3/7).

Simplify (x^(5/8))^(4/5).

Simplify (x^(9/10))^(5/6).

Simplify (x^(11/12))^(6/11).

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Unfamiliar transfer

Explain, compare, and revise

Simplify [(x^(3/2)y^(1/2))]² and justify why both factors receive the outer power.

Write a first attempt before opening the self-check.

The learner record reveals exact answers and model reasoning only after an attempt.