Find the Domain of 3/√(2x-3): Square Root Function Analysis

Question

Look at the following function:

32x3 \frac{3}{\sqrt{2x-3}}

What is the domain of the function?

Video Solution

Solution Steps

00:00 Does the function have a domain? If so, what is it?
00:04 The root must be for a positive number greater than 0
00:11 Let's isolate X
00:21 And this is the solution to the question

Step-by-Step Solution

To solve this problem, we need to determine the domain of the function given by 32x3 \frac{3}{\sqrt{2x-3}} . The fraction is undefined whenever the denominator is zero, and the square root requires the expression inside to be positive.

Let's break down the steps:

  • Since the square root is in the denominator, 2x3 2x - 3 must be strictly greater than zero.
  • Set up the inequality: 2x3>0 2x - 3 > 0 .
  • Solve the inequality for x x :
    • Add 3 to both sides: 2x>3 2x > 3 .
    • Divide both sides by 2: x>1.5 x > 1.5 .

The domain of the function is all real numbers x x such that x>1.5 x > 1.5 . Therefore, we write the domain as x>1.5 x > 1.5 .

Hence, the correct choice among the given options is: x>1.5 x > 1.5 which corresponds to choice number 3.

Answer

x > 1.5