Simplify 5^(-2) × 5^(-1) × 5: Negative Exponent Reduction

Exponent Addition with Mixed Positive-Negative Powers

Reduce the following equation:

52×51×5= 5^{-2}\times5^{-1}\times5=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Simplify the following problem
00:03 Any number raised to the power of 1 is always equal to itself
00:07 We will apply this formula to our exercise, and raise to the power of 1
00:13 According to the laws of exponents, the multiplication of powers with equal bases (A)
00:18 equals the same base raised to the power of the sum of the exponents (N+M)
00:22 We will apply this formula to our exercise
00:27 Note that we are adding a negative factor
00:41 A positive x A negative is always negative, therefore we subtract as follows
00:48 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Reduce the following equation:

52×51×5= 5^{-2}\times5^{-1}\times5=

2

Step-by-step solution

To solve this problem, we'll apply the rule for multiplying powers with the same base:

  • Step 1: Identify the expression given, 52×51×5 5^{-2}\times5^{-1}\times5 .
  • Step 2: Notice that all terms are powers of 5. Therefore, we can add their exponents.
  • Step 3: The exponents are -2 for 52 5^{-2} , -1 for 51 5^{-1} , and 1 for 5 5 .

Let's perform the required calculations:

2+(1)+1=2-2 + (-1) + 1 = -2

Using the power rule, the expression simplifies to:

52=52 5^{-2} = 5^{-2}

Therefore, the reduced form of the equation 52×51×5 5^{-2}\times5^{-1}\times5 is 52 5^{-2} .

3

Final Answer

52 5^{-2}

Key Points to Remember

Essential concepts to master this topic
  • Rule: When multiplying same bases, add all exponents together
  • Technique: Calculate -2 + (-1) + 1 = -2 step by step
  • Check: Convert to fractions: 1/25 × 1/5 × 5 = 1/25 ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying exponents instead of adding them
    Don't multiply -2 × -1 × 1 = 2 when combining powers! This treats exponents like regular multiplication and gives 52 5^2 instead of 52 5^{-2} . 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

Why do I add exponents when multiplying powers?

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The power rule states that am×an=am+n a^m \times a^n = a^{m+n} . Think of it as: 52×53=(5×5)×(5×5×5)=55 5^2 \times 5^3 = (5 \times 5) \times (5 \times 5 \times 5) = 5^5 . You're combining groups of the same base!

What does 52 5^{-2} actually mean?

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A negative exponent means reciprocal: 52=152=125 5^{-2} = \frac{1}{5^2} = \frac{1}{25} . It's the opposite of positive powers - instead of multiplying, you're dividing.

How do I handle adding negative and positive exponents?

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Treat them like regular addition with integers: -2 + (-1) + 1. The negative signs stay with their numbers, so you get -2 - 1 + 1 = -2.

Can I check my answer by converting to fractions?

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Absolutely! Convert each term: 52=125 5^{-2} = \frac{1}{25} , 51=15 5^{-1} = \frac{1}{5} , and 51=5 5^1 = 5 . Then multiply: 125×15×5=125 \frac{1}{25} \times \frac{1}{5} \times 5 = \frac{1}{25} = 52 5^{-2}

What if I forget whether to add or multiply exponents?

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Remember: Same operation, add exponents (multiplying powers). Different operation, multiply exponents (power of a power). Since we're multiplying 52×51×51 5^{-2} \times 5^{-1} \times 5^1 , we add!

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