Analyzing Domain in Rational Equation: 14/x - 6x = 2/(x-5)

Domain Analysis with Rational Functions

Find the area of domain (no need to solve)

14x6x=2x5 \frac{14}{x}-6x=\frac{2}{x-5}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the domain of substitution
00:03 Domain exists, to ensure we definitely don't divide by 0
00:07 This is one domain, now let's find the second one
00:12 Let's isolate X to find the domain of substitution
00:21 This is the second domain, the domain of substitution is both of them together
00:24 This is the domain of substitution, and this is the solution to the question

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)

14x6x=2x5 \frac{14}{x}-6x=\frac{2}{x-5}

2

Step-by-step solution

To find the domain of the given function, we need to determine where the function is undefined due to division by zero. The function in question is:

14x6x=2x5 \frac{14}{x} - 6x = \frac{2}{x-5}

We identify two fractions: 14x \frac{14}{x} and 2x5 \frac{2}{x-5} . Each fraction has a denominator that can potentially cause division by zero:

  • For 14x \frac{14}{x} , the denominator x x shouldn't be zero. Thus, x0 x \neq 0 .
  • For 2x5 \frac{2}{x-5} , the denominator x5 x-5 shouldn't be zero. Thus, x5 x \neq 5 .

By excluding these values from the set of all real numbers, we obtain the domain of the function. Therefore, the domain consists of all real numbers except for x=0 x = 0 and x=5 x = 5 .

Thus, the domain of the function is x0,x5 x \neq 0, x \neq 5 .

3

Final Answer

x0,x5 x≠0,x≠5

Key Points to Remember

Essential concepts to master this topic
  • Rule: Domain excludes values that make denominators equal zero
  • Technique: Set each denominator ≠ 0: x ≠ 0 and x - 5 ≠ 0
  • Check: Verify both restrictions: x ≠ 0, x ≠ 5 covers all undefined points ✓

Common Mistakes

Avoid these frequent errors
  • Only finding restrictions from one fraction
    Don't just check 14x \frac{14}{x} and forget 2x5 \frac{2}{x-5} = missing x ≠ 5 restriction! This gives an incomplete domain that includes undefined values. Always examine every denominator in the equation for zero restrictions.

Practice Quiz

Test your knowledge with interactive questions

\( 2x+\frac{6}{x}=18 \)

What is the domain of the above equation?

FAQ

Everything you need to know about this question

Why don't we consider the -6x term when finding domain?

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The term -6x has no denominator, so it's defined for all real numbers. Only fractions with variables in denominators can create domain restrictions.

What does x ≠ 0, x ≠ 5 actually mean?

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This means the function is defined for all real numbers except 0 and 5. You can use any value like x = 1, x = 10, or x = -3, but never x = 0 or x = 5.

Do I need to solve the equation to find the domain?

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No! Domain only depends on where the function is undefined, not on the solutions. You just need to find where denominators equal zero.

What if I accidentally wrote x ≠ -5 instead of x ≠ 5?

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That's a common sign error! From x5=0 x - 5 = 0 , we get x = 5, so the restriction is x ≠ 5. Always solve the equation denominator = 0 carefully.

Can the domain ever be empty or all real numbers?

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For this type of rational equation, the domain is never empty. It could be all real numbers only if there were no variables in any denominators, which isn't the case here.

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