Simplify (a/3)²: Squaring a Specific Fraction Expression

Fraction Exponents with Algebraic Variables

Insert the corresponding expression:

(a3)2= \left(\frac{a}{3}\right)^2=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:07 Let's simplify this problem together.
00:10 When a fraction is raised to the power of N, remember,
00:14 both the numerator and denominator get the same power, N.
00:20 Let's apply this rule to our exercise.
00:23 We'll raise both the top and bottom numbers to the power of N.
00:28 And here's our solution. Well done!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Insert the corresponding expression:

(a3)2= \left(\frac{a}{3}\right)^2=

2

Step-by-step solution

We need to rewrite the expression (a3)2\left(\frac{a}{3}\right)^2 using the rule of exponents for fractions. This rule states that if you have a fraction (mn)\left(\frac{m}{n}\right) and you raise it to a power kk, it is equivalent to raising both the numerator and the denominator to the power kk. Therefore, we have:

(a3)2=a232 \left(\frac{a}{3}\right)^2 = \frac{a^2}{3^2}

Here, a2a^2 is the numerator and 323^2 is the denominator. The expression simplifies to:

a29 \frac{a^2}{9}

Based on the provided choices, the correct answer is:

Choice 1: a232 \frac{a^2}{3^2}

Therefore, the solution to the given problem is a232 \frac{a^2}{3^2} .

3

Final Answer

a232 \frac{a^2}{3^2}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Apply exponent to both numerator and denominator separately
  • Technique: (a3)2=a232=a29 \left(\frac{a}{3}\right)^2 = \frac{a^2}{3^2} = \frac{a^2}{9}
  • Check: Verify by expanding: multiply the fraction by itself to confirm ✓

Common Mistakes

Avoid these frequent errors
  • Only applying the exponent to the numerator
    Don't write (a3)2=a23 \left(\frac{a}{3}\right)^2 = \frac{a^2}{3} = wrong answer! This ignores the fact that the entire fraction is being squared. Always apply the exponent to both the numerator AND denominator: (a3)2=a232 \left(\frac{a}{3}\right)^2 = \frac{a^2}{3^2} .

Practice Quiz

Test your knowledge with interactive questions

\( \)Choose the corresponding expression:

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

FAQ

Everything you need to know about this question

Why do I square both the top and bottom of the fraction?

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When you square a fraction, you're multiplying the entire fraction by itself: a3×a3=a×a3×3=a232 \frac{a}{3} \times \frac{a}{3} = \frac{a \times a}{3 \times 3} = \frac{a^2}{3^2} . Both parts get multiplied!

Should I simplify a232 \frac{a^2}{3^2} to a29 \frac{a^2}{9} ?

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Both forms are correct! a232 \frac{a^2}{3^2} shows the process clearly, while a29 \frac{a^2}{9} is the simplified form. Check which form your teacher prefers.

What if the fraction had a bigger exponent like 3 or 4?

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Same rule applies! For (a3)3 \left(\frac{a}{3}\right)^3 , you get a333=a327 \frac{a^3}{3^3} = \frac{a^3}{27} . The exponent goes on both parts of the fraction.

Can I use this rule with numbers instead of variables?

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Absolutely! (25)2=2252=425 \left(\frac{2}{5}\right)^2 = \frac{2^2}{5^2} = \frac{4}{25} . The same rule works whether you have variables or specific numbers.

What's the difference between a232 \frac{a^2}{3^2} and a32 \frac{a}{3^2} ?

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Big difference! a232 \frac{a^2}{3^2} means both the numerator and denominator are squared. a32 \frac{a}{3^2} only squares the denominator, which is incorrect for this problem.

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