Simplify a^(-3x) × a^b × a^b: Exponent Multiplication Practice

Exponent Rules with Multiple Same-Base Terms

Reduce the following equation:

a3x×ab×ab= a^{-3x}\times a^b\times a^b=

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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 According to the laws of exponents, multiplying powers with the same base (A)
00:06 equals the same base raised to the sum of the exponents (N+M)
00:10 We will apply this formula to our exercise, one operation at a time
00:13 We'll maintain the base and add the exponents together
00:28 Let's collect the terms
00:31 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:

a3x×ab×ab= a^{-3x}\times a^b\times a^b=

2

Step-by-step solution

To reduce the given equation a3x×ab×ab a^{-3x} \times a^b \times a^b , we will use the multiplication of powers rule for exponents, which states that if you multiply powers with the same base, you add the exponents.

Let's follow the steps:

  • Step 1: Identify that all terms share the same base, a a .

  • Step 2: Apply the rule: a3x×ab×ab=a3x+b+b a^{-3x} \times a^b \times a^b = a^{-3x + b + b} .

  • Step 3: Simplify the exponents by adding them: 3x+b+b=3x+2b -3x + b + b = -3x + 2b .

Therefore, the reduced form of the equation is a3x+2b a^{-3x + 2b} .

3

Final Answer

a3x+2b a^{-3x+2b}

Key Points to Remember

Essential concepts to master this topic
  • Rule: When multiplying powers with same base, add the exponents
  • Technique: Combine ab×ab a^b \times a^b as ab+b=a2b a^{b+b} = a^{2b}
  • Check: Count exponent terms: -3x + b + b = -3x + 2b ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying exponents instead of adding them
    Don't multiply the exponents like a3x×ab×ab=a3xbb a^{-3x} \times a^b \times a^b = a^{-3x \cdot b \cdot b} = wrong answer! This confuses the power rule with multiplication rule. Always add exponents when multiplying same bases: a3x+b+b=a3x+2b a^{-3x+b+b} = a^{-3x+2b} .

Practice Quiz

Test your knowledge with interactive questions

\( (3\times4\times5)^4= \)

FAQ

Everything you need to know about this question

Why do I add the exponents instead of multiplying them?

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The multiplication rule for exponents states that am×an=am+n a^m \times a^n = a^{m+n} . Think of it this way: a2×a3=(aa)×(aaa)=a5 a^2 \times a^3 = (a \cdot a) \times (a \cdot a \cdot a) = a^5 , which is 2 + 3 = 5, not 2 × 3 = 6!

What do I do with the repeated ab a^b terms?

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Since ab×ab a^b \times a^b means you have the same exponent twice, you add: b+b=2b b + b = 2b . It's like adding any like terms in algebra!

Can I simplify a3x+2b a^{-3x+2b} further?

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No, this is the simplified form! Since 3x -3x and 2b 2b are different variable terms, they cannot be combined further. The expression is fully simplified.

What if the exponents had numbers instead of variables?

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The process is identical! For example: a6×a4×a4=a6+4+4=a2 a^{-6} \times a^4 \times a^4 = a^{-6+4+4} = a^2 . Just add all the exponents together, whether they're numbers or variables.

How do I handle negative exponents in addition?

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Treat negative exponents just like negative numbers in addition. For 3x+b+b -3x + b + b , you get 3x+2b -3x + 2b . The negative sign stays with the 3x term.

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