Simplify the Expression: (6⁸ × 7⁸) ÷ 17⁸

Exponent Rules with Product Simplification

Insert the corresponding expression:

68×78178= \frac{6^8\times7^8}{17^8}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:09 Let's simplify this problem together.
00:13 Remember, when a product is raised to a power, like N, we use the laws of exponents.
00:18 This means each part of the product can be raised to the power of N by itself.
00:25 Let's apply this rule to our example, turning it into parentheses with exponents.
00:30 And that's how we find the 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:

68×78178= \frac{6^8\times7^8}{17^8}=

2

Step-by-step solution

To simplify the given expression 68×78178 \frac{6^8 \times 7^8}{17^8} , we'll use the following steps:

  • Step 1: Apply the power of a product rule. We know that an×bn=(a×b)n a^n \times b^n = (a \times b)^n .
  • Step 2: Simplify the expression by recognizing that the numerator 68×78 6^8 \times 7^8 can be rewritten using the power of a product rule.

Now, let's simplify the numerator:

68×78=(6×7)8 6^8 \times 7^8 = (6 \times 7)^8

Thus, the expression becomes:

(6×7)8178 \frac{(6 \times 7)^8}{17^8}

This matches the form given in choice (6×7)8178 \frac{\left(6\times7\right)^8}{17^8} . Therefore, this is the correct simplification of the original expression.

Therefore, the correct answer is (6×7)8178 \frac{(6 \times 7)^8}{17^8} , corresponding to choice 3.

3

Final Answer

(6×7)8178 \frac{\left(6\times7\right)^8}{17^8}

Key Points to Remember

Essential concepts to master this topic
  • Product Rule: When bases have same exponent, an×bn=(a×b)n a^n \times b^n = (a \times b)^n
  • Technique: Combine 68×78 6^8 \times 7^8 into (6×7)8=428 (6 \times 7)^8 = 42^8
  • Check: Final form (6×7)8178 \frac{(6 \times 7)^8}{17^8} maintains same exponent throughout ✓

Common Mistakes

Avoid these frequent errors
  • Adding exponents when multiplying with same exponents
    Don't change 68×78 6^8 \times 7^8 to (6×7)16 (6 \times 7)^{16} = wrong power! This incorrectly adds exponents instead of using the product rule. Always use an×bn=(a×b)n a^n \times b^n = (a \times b)^n when exponents are the same.

Practice Quiz

Test your knowledge with interactive questions

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

FAQ

Everything you need to know about this question

Why can I combine 68×78 6^8 \times 7^8 but not 68×75 6^8 \times 7^5 ?

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The product rule for exponents only works when the exponents are identical! an×bn=(a×b)n a^n \times b^n = (a \times b)^n , but if exponents differ, you cannot combine them this way.

Do I multiply 6 × 7 to get the final answer?

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Not necessarily! The question asks for the simplified expression, which is (6×7)8178 \frac{(6 \times 7)^8}{17^8} . You could calculate 428178 \frac{42^8}{17^8} , but that's not required for this problem.

Can I cancel the 8th powers in numerator and denominator?

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No! You can only cancel identical factors. Since (6×7)8178 (6 \times 7)^8 \neq 17^8 , the powers don't cancel. The expression (6×7)8178 \frac{(6 \times 7)^8}{17^8} is already in simplest form.

What if I see different exponents in the numerator?

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If exponents are different, like 65×78 6^5 \times 7^8 , you cannot use the product rule. Each term must have the same exponent to combine using an×bn=(a×b)n a^n \times b^n = (a \times b)^n .

Is there another way to write this expression?

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Yes! You could also write it as (6×717)8 \left(\frac{6 \times 7}{17}\right)^8 or (4217)8 \left(\frac{42}{17}\right)^8 , but the form (6×7)8178 \frac{(6 \times 7)^8}{17^8} clearly shows the product rule application.

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