Solve: Finding the Negative Absolute Value of 3⁴

Absolute Value with Negative Signs

34= -\lvert3^4\rvert=

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

34= -\lvert3^4\rvert=

2

Step-by-step solution

First, calculate the fourth power of 3: 34=81 3^4 = 81 .

Then, apply the absolute value:
since 81 is positive, 81=81 \lvert 81 \rvert = 81 .

Finally, apply the negative sign outside the absolute value: 81=81 -\lvert 81 \rvert = -81 .

3

Final Answer

81 -81

Key Points to Remember

Essential concepts to master this topic
  • Order: Calculate exponent first, then absolute value, then negative sign
  • Technique: 34=81 3^4 = 81 , then 81=81 |81| = 81 , then 81 -81
  • Check: Verify 34=81=81 -|3^4| = -|81| = -81 follows order of operations ✓

Common Mistakes

Avoid these frequent errors
  • Applying negative sign before absolute value
    Don't calculate 34 |-3^4| = 81! The negative is outside the absolute value bars, not inside. This gives the wrong positive result instead of negative. Always follow order of operations: exponent first, then absolute value, then the negative sign outside.

Practice Quiz

Test your knowledge with interactive questions

Determine the absolute value of the following number:

\( \left|18\right|= \)

FAQ

Everything you need to know about this question

Why isn't the answer positive 81?

+

The negative sign is outside the absolute value bars! This means we calculate 34=81 |3^4| = 81 first, then apply the negative to get 81 -81 .

What's the difference between 34 -|3^4| and 34 |-3^4| ?

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34=81 -|3^4| = -81 (negative outside), but 34=(81)=81=81 |-3^4| = |-(81)| = |-81| = 81 (negative inside). The position of the negative sign completely changes the answer!

Do I calculate the exponent or absolute value first?

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Always calculate the exponent first! Order of operations says: Parentheses, Exponents, then other operations. So 34=81 3^4 = 81 , then 81=81 |81| = 81 .

Can absolute value ever give a negative result?

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Absolute value itself is always positive or zero. However, when there's a negative sign outside the absolute value bars (like x -|x| ), the final result will be negative!

What if the base was negative, like (3)4 -|(-3)^4| ?

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(3)4=81 (-3)^4 = 81 because negative times negative four times equals positive. Then 81=81 -|81| = -81 . The result is the same!

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