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

Question

Look at the following function:

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

What is the domain of the function?

Video Solution

Solution Steps

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 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 .

Answer

x > 5