Simplify (7×13)^13 ÷ (13×7)^17: Power Operations with Equal Bases

Exponent Division with Negative Powers

Insert the corresponding expression:

(7×13)13(13×7)17= \frac{\left(7\times13\right)^{13}}{\left(13\times7\right)^{17}}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:13 Let's start simply.
00:16 In multiplication, don't worry about the order of numbers.
00:21 We'll practice this by flipping the numbers around.
00:25 Now, let's divide using powers.
00:28 Take a number, call it A, to the power of N.
00:32 Divide by the same number A to the power of M.
00:36 This equals A to the power of M minus N. Got it?
00:41 Let's calculate that power now.
00:45 Now switch the numbers back around.
00:49 And that's how we solve this problem!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Insert the corresponding expression:

(7×13)13(13×7)17= \frac{\left(7\times13\right)^{13}}{\left(13\times7\right)^{17}}=

2

Step-by-step solution

The question requires us to simplify the given expression using the laws of exponents, specifically the Power of a Quotient Rule for Exponents. The given expression is:

(7×13)13(13×7)17 \frac{\left(7\times13\right)^{13}}{\left(13\times7\right)^{17}}

We can rewrite the expression inside both the numerator and the denominator to express them more clearly:

(7×13)13=(91)13 \left(7\times13\right)^{13} = (91)^{13} and (13×7)17=(91)17 \left(13\times7\right)^{17} = (91)^{17}

The expression now looks like this:

(91)13(91)17 \frac{(91)^{13}}{(91)^{17}}

According to the properties of exponents, specifically the rule for dividing same bases, we subtract the exponents:

(91)1317=(91)4 (91)^{13-17} = (91)^{-4}

The expression now simplified is:

1(91)4 \frac{1}{(91)^4}

Therefore, we see that the simplified answer does not directly correspond to the given answer of "a' + b' = c'." It seems there might be a discrepancy in the final simplification or understanding, as we derived:

The solution to the question is: 1(91)4 \frac{1}{(91)^4}

I couldn't get to the shown answer, "a'+b' are correct."

3

Final Answer

a'+b' are correct

Key Points to Remember

Essential concepts to master this topic
  • Base Recognition: Identify that 7×13 equals 13×7 (same base)
  • Quotient Rule: am÷an=amn a^m ÷ a^n = a^{m-n} gives 911317=914 91^{13-17} = 91^{-4}
  • Verify: Check that 1914 \frac{1}{91^4} equals original expression ✓

Common Mistakes

Avoid these frequent errors
  • Not recognizing equal bases in different order
    Don't treat (7×13) and (13×7) as different bases = impossible simplification! Multiplication is commutative, so these are identical. Always recognize that changing order doesn't change the product.

Practice Quiz

Test your knowledge with interactive questions

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

FAQ

Everything you need to know about this question

Why are (7×13) and (13×7) the same base?

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Because multiplication is commutative! This means order doesn't matter: 7×13 = 91 and 13×7 = 91. They're the exact same number, so we can use the quotient rule.

What does the negative exponent mean?

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A negative exponent means reciprocal! So 914=1914 91^{-4} = \frac{1}{91^4} . The negative sign flips the base to the denominator.

How do I subtract exponents when dividing?

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Use the quotient rule: am÷an=amn a^m ÷ a^n = a^{m-n} . Here: 9113÷9117=911317=914 91^{13} ÷ 91^{17} = 91^{13-17} = 91^{-4} .

Can I multiply 7×13 first to get 91?

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Yes! That's actually helpful for seeing the pattern clearly. Both the numerator and denominator become powers of 91, making the division rule easy to apply.

Why isn't the answer one of the given choices?

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The correct mathematical answer is 1914 \frac{1}{91^4} . Sometimes test questions have errors, or there might be additional context we're missing from the original problem.

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