Explore Rational Equation Domains: Find the Area of (x/(5x-69) = 2/(x-1)

Domain Restrictions with Rational Equations

Find the area of domain (no need to solve)

x5x6=2x1 \frac{x}{5x-6}=\frac{2}{x-1}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:09 Let's find where we can substitute values in.
00:12 To avoid dividing by zero, we check our options.
00:17 First, let's isolate X, to see where substitutions work.
00:21 Great! That's one. Now, we'll do the same for another part.
00:28 Combine both parts, and we've got our solution! Well done!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Find the area of domain (no need to solve)

x5x6=2x1 \frac{x}{5x-6}=\frac{2}{x-1}

2

Step-by-step solution

To solve the problem, follow these steps:

  • Step 1: Identify where each denominator is zero to find the domain restrictions.

  • Step 2: Solve each condition separately to exclude the non-permissible xx values.

Now, let's work through each step:

Step 1: The first expression involves the denominator 5x65x - 6. Set it to zero:

5x6=05x - 6 = 0

Solve for xx:
5x=65x = 6
x=65=115x = \frac{6}{5} = 1\frac{1}{5}

This means the function is undefined for x=115x = 1\frac{1}{5}.

Step 2: The second expression involves the denominator x1x - 1. Set it to zero:

x1=0x - 1 = 0

Solve for xx:
x=1x = 1

This means the function is undefined for x=1x = 1.

The domain of this expression is all real numbers except where these denominators are zero. Therefore, the domain restriction is:

The values of xx cannot equal 1 or 115 1\frac{1}{5} , which corresponds to choice 3.

Therefore, the solution to the problem is x1,x115 x \neq 1, x \neq 1\frac{1}{5} .

3

Final Answer

x1,x115 x≠1,x≠1\frac{1}{5}

Key Points to Remember

Essential concepts to master this topic
  • Domain Rule: Denominators cannot equal zero in rational equations
  • Technique: Set each denominator to zero: 5x - 6 = 0 gives x = 6/5
  • Check: Verify restrictions make denominators zero: 5(6/5) - 6 = 0 ✓

Common Mistakes

Avoid these frequent errors
  • Only checking one denominator for domain restrictions
    Don't just set x - 1 = 0 and ignore 5x - 6 = 0! This misses critical restrictions and gives incomplete domain analysis. Always check every single denominator in the equation for zero values.

Practice Quiz

Test your knowledge with interactive questions

Select the the domain of the following fraction:

\( \frac{6}{x} \)

FAQ

Everything you need to know about this question

Why do I need to find domain restrictions before solving?

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Domain restrictions tell you which x-values are forbidden because they make denominators zero. This prevents division by zero errors and helps you understand where the equation is actually valid!

What's the difference between domain and solving the equation?

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The domain shows which x-values are allowed in the equation, while solving finds which x-values make the equation true. You need both for complete understanding!

How do I write mixed numbers like 1⅕?

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Convert to improper fraction first: 115=65 1\frac{1}{5} = \frac{6}{5} . Then write the restriction as x ≠ 6/5 or keep it as the mixed number x ≠ 1⅕.

Can the domain restriction be the same as the solution?

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No! Domain restrictions are forbidden values that make denominators zero. If a solution equals a domain restriction, then there's no solution to the equation.

Do I always get exactly two domain restrictions?

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Not always! It depends on how many different denominators you have. Each unique denominator can create one restriction, so you might have 1, 2, 3, or more restrictions.

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