Simplify (16×7)^6 ÷ (16×7)^8: Division of Powers with Same Base

Exponent Division with Numerical Bases

Insert the corresponding expression:

(16×7)6(16×7)8= \frac{\left(16\times7\right)^6}{\left(16\times7\right)^8}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Simply
00:02 We'll use the formula for dividing powers
00:04 Any number (A) to the power of (N) divided by the same base (A) to the power of (M)
00:07 equals the number (A) to the power of the difference of exponents (M-N)
00:10 We'll use this formula in our exercise
00:12 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Insert the corresponding expression:

(16×7)6(16×7)8= \frac{\left(16\times7\right)^6}{\left(16\times7\right)^8}=

2

Step-by-step solution

We start by analyzing the expression: (16×7)6(16×7)8 \frac{\left(16\times7\right)^6}{\left(16\times7\right)^8} .

This expression is a perfect candidate for applying the Power of a Quotient Rule for Exponents, which states:

aman=amn \frac{a^m}{a^n} = a^{m-n} , where a a is a nonzero number, and m m and n n are integers.

In our case, a=16×7 a = 16 \times 7 , m=6 m = 6 , and n=8 n = 8 .


Applying the rule, we subtract the exponents of the base 16×7 16 \times 7 :

(16×7)6(16×7)8=(16×7)68 \frac{\left(16\times7\right)^6}{\left(16\times7\right)^8} = \left(16\times7\right)^{6-8} .

Now, simplify the exponent:

68=2 6 - 8 = -2

Thus, the expression simplifies to:

(16×7)2 \left(16\times7\right)^{-2} .


However, comparing with the provided solution, it shows (16×7)68 \left(16\times7\right)^{6-8} , which is the form before the numerical simplification of the exponent.

The solution to the question is: (16×7)68 \left(16\times7\right)^{6-8} .

3

Final Answer

(16×7)68 \left(16\times7\right)^{6-8}

Key Points to Remember

Essential concepts to master this topic
  • Division Rule: When dividing same bases, subtract the exponents
  • Technique: Apply aman=amn \frac{a^m}{a^n} = a^{m-n} where 16×7 is the base
  • Check: Verify base is identical: (16×7)^6 and (16×7)^8 have same base ✓

Common Mistakes

Avoid these frequent errors
  • Adding or multiplying exponents instead of subtracting
    Don't add exponents like 6+8=14 or multiply like 6×8=48! This gives completely wrong results like (16×7)14 (16×7)^{14} instead of (16×7)2 (16×7)^{-2} . Always subtract the bottom exponent from the top exponent when dividing.

Practice Quiz

Test your knowledge with interactive questions

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

FAQ

Everything you need to know about this question

Why do we subtract 8-6 instead of 6-8?

+

The rule is top exponent minus bottom exponent. Since 6 is in the numerator (top) and 8 is in the denominator (bottom), we calculate 68=2 6-8 = -2 . Order matters!

Do I need to calculate 16×7 first?

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No! Keep 16×7 16×7 as one base. The division rule works with any base, whether it's a single number or an expression like 16×7 16×7 .

What does a negative exponent mean?

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A negative exponent like (16×7)2 (16×7)^{-2} means 1(16×7)2 \frac{1}{(16×7)^2} . It's the reciprocal of the positive exponent.

Can I use this rule with different bases?

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No! The division rule aman=amn \frac{a^m}{a^n} = a^{m-n} only works when the bases are exactly the same. Different bases require different methods.

How do I remember which exponent to subtract from which?

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Think "top minus bottom": numerator exponent minus denominator exponent. In a6a8 \frac{a^6}{a^8} , it's always 68 6-8 , not 86 8-6 .

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