Simplify the Algebraic Fraction: 3a²/2a Step-by-Step Solution

Algebraic Fraction Simplification with Exponents

Solve the exercise:

3a22a= \frac{3a^2}{2a}=

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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 When dividing powers with equal bases
00:07 The power of the result equals the difference between the exponents
00:11 We'll apply this formula to our exercise, and subtract the exponents
00:24 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve the exercise:

3a22a= \frac{3a^2}{2a}=

2

Step-by-step solution

Due to the fact that the numerator and the denominator of the fraction have terms with identical bases, we will begin by applying the law of exponents for the division of terms with identical bases:

bmbn=bmn \frac{b^m}{b^n}=b^{m-n} We apply it to the problem:

3a22a=32a21=32a1 \frac{3a^2}{2a}=\frac{3}{2}\cdot a^{2-1}=\frac{3}{2}\cdot a^1 In the first step we simplify the numerical part of the fraction. This is a simple and intuitive step which makes it easier to work with the said fraction.

3a22a=32a2a=32a21= \frac{3a^2}{2a}=\frac{3}{2}\cdot\frac{a^2}{a}=\frac{3}{2}\cdot a^{2-1}=\ldots Let's return to the problem, remember that any number raised to 1 is equal to the number itself, that is:

b1=b b^1=b Thus we apply it to the problem:

32a1=32a=112a \frac{3}{2}\cdot a^1=\frac{3}{2}\cdot a=1\frac{1}{2}a In the last step we convert the fraction into a mixed fraction.

Therefore, the correct answer is option D.

3

Final Answer

112a 1 \frac{1}{2}a

Key Points to Remember

Essential concepts to master this topic
  • Division Rule: When dividing powers with same base, subtract exponents
  • Technique: Separate coefficients: 3a22a=32a2a=32a21 \frac{3a^2}{2a} = \frac{3}{2} \cdot \frac{a^2}{a} = \frac{3}{2} \cdot a^{2-1}
  • Check: Substitute a=2: 3(4)2(2)=124=3=32(2) \frac{3(4)}{2(2)} = \frac{12}{4} = 3 = \frac{3}{2}(2)

Common Mistakes

Avoid these frequent errors
  • Canceling variables without considering exponents
    Don't just cancel the 'a' terms and get 32 \frac{3}{2} = wrong answer! This ignores that a2 a^2 and a a have different powers. Always apply the exponent rule: a2a=a21=a \frac{a^2}{a} = a^{2-1} = a first.

Practice Quiz

Test your knowledge with interactive questions

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

FAQ

Everything you need to know about this question

Why can't I just cancel out the 'a' from top and bottom?

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You can cancel, but you must be careful with the exponents! a2 a^2 means a×a a \times a , so when you cancel one 'a' from the bottom, you're left with one 'a' on top.

What's the difference between 32a \frac{3}{2}a and 112a 1\frac{1}{2}a ?

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They're the same value! 32=112 \frac{3}{2} = 1\frac{1}{2} because 3 ÷ 2 = 1 remainder 1. Both forms are correct, but mixed numbers are often preferred in final answers.

Do I always subtract exponents when dividing?

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Only when the bases are the same! For aman \frac{a^m}{a^n} , use amn a^{m-n} . If bases are different like a2b \frac{a^2}{b} , you cannot simplify the exponents.

What if the exponent becomes zero or negative?

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If you get a0=1 a^0 = 1 and an=1an a^{-n} = \frac{1}{a^n} . For example: a2a3=a1=1a \frac{a^2}{a^3} = a^{-1} = \frac{1}{a} .

How do I know which answer choice matches my result?

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Convert your answer to match the format of the choices. Here, 32a \frac{3}{2}a equals 112a 1\frac{1}{2}a , so look for the mixed number form in the options.

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