Find the Domain of 5/√(x-5): Analyzing Function Restrictions

Look at the following function:

5x5 \frac{5}{\sqrt{x-5}}

What is the domain of the function?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Does the function have a domain? And if so, what is it?
00:03 A root must be for a positive number greater than 0
00:09 Let's isolate X
00:14 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Look at the following function:

5x5 \frac{5}{\sqrt{x-5}}

What is the domain of the function?

2

Step-by-step solution

To determine the domain of the function 5x5 \frac{5}{\sqrt{x-5}} , we must ensure that the expression inside the square root, x5 x-5 , is positive. Furthermore, because the square root is in the denominator, x5 x-5 must be greater than zero:

  • Step 1: Set the argument of the square root greater than zero: x5>0 x-5 > 0 .
  • Step 2: Solve the inequality: Add 5 to both sides to get x>5 x > 5 .

Since the inequality x>5 x > 5 ensures that the denominator is neither zero nor negative, it defines the domain of the function. Thus, the function 5x5 \frac{5}{\sqrt{x-5}} is defined for all real numbers x x where x>5 x > 5 .

Therefore, the domain of the function is x>5 x > 5 .

3

Final Answer

x>5 x > 5

Practice Quiz

Test your knowledge with interactive questions

Given the following function:

\( \frac{5-x}{2-x} \)

Does the function have a domain? If so, what is it?

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