Compare Base-3 Powers: Evaluating 3^(-5)×3^17×3^(-7) ⬜ 3^2×3^1×3

Exponent Rules with Negative Powers

Insert the compatible sign:

>,<,= >,<,=

35×317×3732×31×3 3^{-5}\times3^{17}\times3^{-7}\Box3^2\times3^1\times3

❤️ Continue Your Math Journey!

We have hundreds of course questions with personalized recommendations + Account 100% premium

Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Select the appropriate sign
00:04 We'll simplify each side using the formula for the multiplication of powers
00:10 We'll apply this formula to our exercise, each time for one multiplication
00:15 We'll maintain the base and add together the exponents
00:26 We'll apply the same formula in order to simplify the right side
00:38 Note that the side with the larger exponent is always greater
00:41 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Insert the compatible sign:

>,<,= >,<,=

35×317×3732×31×3 3^{-5}\times3^{17}\times3^{-7}\Box3^2\times3^1\times3

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Simplify the left-hand side expression.

  • Step 2: Simplify the right-hand side expression.

  • Step 3: Compare the results.

Let's work through each step:

Step 1: Simplifying the left-hand side expression:

The expression is 35×317×373^{-5} \times 3^{17} \times 3^{-7}.

Use the rule of exponents for multiplication: am×an=am+na^m \times a^n = a^{m+n}.

Add the exponents: 5+177=5-5 + 17 - 7 = 5.

So, 35×317×37=353^{-5} \times 3^{17} \times 3^{-7} = 3^5.

Step 2: Simplifying the right-hand side expression:

The expression is 32×31×33^2 \times 3^1 \times 3.

This can be rewritten as 32×31×313^2 \times 3^1 \times 3^1, since 3=313 = 3^1.

Add the exponents: 2+1+1=42 + 1 + 1 = 4.

So, 32×31×3=343^2 \times 3^1 \times 3 = 3^4.

Step 3: Compare 353^5 and 343^4.

Since the base 3 is the same, compare the exponents: 55 and 44.

Since 5>45 > 4, it follows that 35>343^5 > 3^4.

Therefore, the inequality sign between the two expressions is >>.

Thus, the correct answer to the initial problem is 35×317×37>32×31×33^{-5}\times3^{17}\times3^{-7} > 3^2\times3^1\times3.

3

Final Answer

>

Key Points to Remember

Essential concepts to master this topic
  • Exponent Rule: When multiplying same bases, add the exponents together
  • Technique: Calculate (-5) + 17 + (-7) = 5 for left side
  • Check: Compare final exponents: 35>34 3^5 > 3^4 since 5 > 4 ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying exponents instead of adding them
    Don't multiply exponents like (-5) × 17 × (-7) = 595! This gives a completely wrong result because you're not using the correct exponent rule. Always add exponents when multiplying powers with the same base.

Practice Quiz

Test your knowledge with interactive questions

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

FAQ

Everything you need to know about this question

What happens when I have negative exponents?

+

Negative exponents don't change how you add them! Just remember that 35 3^{-5} means 135 \frac{1}{3^5} , but when multiplying, you still add: (-5) + 17 + (-7) = 5.

Why do I add exponents instead of multiplying them?

+

The rule am×an=am+n a^m \times a^n = a^{m+n} comes from how multiplication works. For example: 32×33=(3×3)×(3×3×3)=35 3^2 \times 3^3 = (3 \times 3) \times (3 \times 3 \times 3) = 3^5 .

How do I compare powers with the same base?

+

When the base is the same and positive (like 3), just compare the exponents! Since 5>4 5 > 4 , we know 35>34 3^5 > 3^4 .

What if I wrote 3 as 3^0 instead of 3^1?

+

That would be incorrect! Remember that 30=1 3^0 = 1 , not 3. The number 3 by itself equals 31 3^1 , so always write it as 3^1 when adding exponents.

Can I just calculate the actual values instead?

+

You could, but it's much easier to use exponent rules! 35=243 3^5 = 243 and 34=81 3^4 = 81 , but comparing exponents (5 vs 4) is faster and less error-prone.

🌟 Unlock Your Math Potential

Get unlimited access to all 18 Exponents Rules questions, detailed video solutions, and personalized progress tracking.

📹

Unlimited Video Solutions

Step-by-step explanations for every problem

📊

Progress Analytics

Track your mastery across all topics

🚫

Ad-Free Learning

Focus on math without distractions

No credit card required • Cancel anytime

More Questions

Click on any question to see the complete solution with step-by-step explanations