Evaluate (5/6)^(-3): Negative Exponent Expression Solution

Negative Exponents with Fractional Bases

Insert the corresponding expression:

(56)3= \left(\frac{5}{6}\right)^{-3}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Simplify the following problem
00:03 According to the laws of exponents, a fraction raised to the power (-N)
00:07 is equal to its reciprocal raised to the opposite power (N)
00:12 We'll apply this formula to our exercise
00:15 Let's invert the fraction
00:19 and raise it to the opposite power (times(-1))
00:22 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Insert the corresponding expression:

(56)3= \left(\frac{5}{6}\right)^{-3}=

2

Step-by-step solution

To solve this problem, we need to convert the expression (56)3\left(\frac{5}{6}\right)^{-3} into a form with positive exponents.

The negative exponent rule states that xn=1xnx^{-n} = \frac{1}{x^n}. Applying this to our given fraction:

(56)3=(65)3\left(\frac{5}{6}\right)^{-3} = \left(\frac{6}{5}\right)^{3}.

This means we take the reciprocal of 56\frac{5}{6}, which is 65\frac{6}{5}, and then raise it to the power of 3.

Therefore, the correct expression is (65)3\left(\frac{6}{5}\right)^3.

This matches choice 1 in the list of possible answers.

3

Final Answer

(65)3 \left(\frac{6}{5}\right)^3

Key Points to Remember

Essential concepts to master this topic
  • Negative Exponent Rule: xn=1xn x^{-n} = \frac{1}{x^n} flips the base and makes exponent positive
  • Reciprocal Method: (56)3=(65)3 \left(\frac{5}{6}\right)^{-3} = \left(\frac{6}{5}\right)^{3} by flipping the fraction
  • Verification: Final answer should have positive exponent with reciprocal base ✓

Common Mistakes

Avoid these frequent errors
  • Applying negative exponent to only numerator or denominator
    Don't change (56)3 \left(\frac{5}{6}\right)^{-3} to 5363 \frac{5^{-3}}{6^3} or similar = wrong answer! The negative exponent applies to the entire fraction, not individual parts. Always flip the whole fraction first, then apply the positive exponent.

Practice Quiz

Test your knowledge with interactive questions

\( 112^0=\text{?} \)

FAQ

Everything you need to know about this question

Why do I flip the fraction when I see a negative exponent?

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The negative exponent rule xn=1xn x^{-n} = \frac{1}{x^n} means "take the reciprocal and make the exponent positive." For fractions, the reciprocal of 56 \frac{5}{6} is 65 \frac{6}{5} - you flip it!

What's the difference between (56)3 \left(\frac{5}{6}\right)^{-3} and 5363 \frac{5^{-3}}{6^{-3}} ?

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They're actually the same value mathematically, but (65)3 \left(\frac{6}{5}\right)^{3} is the simplified form we want. The negative exponent applies to the whole fraction, not separately to numerator and denominator.

Do I need to calculate the final numerical value?

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Not for this type of problem! The question asks for the equivalent expression, so (65)3 \left(\frac{6}{5}\right)^{3} is the complete answer. You don't need to compute 216125 \frac{216}{125} .

How can I remember which way to flip the fraction?

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Think of it as "undoing" the negative: negative exponent means "flip and make positive." So (56)3 \left(\frac{5}{6}\right)^{-3} becomes (65)3 \left(\frac{6}{5}\right)^{3} - flip the fraction, flip the sign!

What if the original expression had a positive exponent?

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Then you wouldn't need to flip anything! (56)3 \left(\frac{5}{6}\right)^{3} would stay as (56)3 \left(\frac{5}{6}\right)^{3} . The negative exponent is what triggers the reciprocal rule.

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