Math Problem Statement

Analyze the function f(x) = 3√(2x) - 1 to determine its parent function, transformations, intercepts, domain, range, end behavior, and intervals of increase/decrease.

Solution

The function given in the image is:

f(x)=32x1f(x) = 3\sqrt{2x} - 1

We can proceed by analyzing the function step by step:

1. Parent Function:

The parent function of f(x)=32x1f(x) = 3\sqrt{2x} - 1 is x\sqrt{x}. This is the basic square root function.

2. Transformations:

Let's break down the transformations applied to the parent function x\sqrt{x}:

  • Horizontal Compression by a factor of 12\frac{1}{2}: The factor 22 inside the square root affects the xx-axis. It compresses the graph horizontally.
  • Vertical Stretch by a factor of 3: The coefficient 3 outside the square root stretches the graph vertically.
  • Vertical Shift Down by 1 unit: The subtraction of 1 shifts the graph downward by 1 unit.

3. Intercepts:

  • x-intercept: To find the x-intercept, set f(x)=0f(x) = 0: 32x1=032x=12x=132x=19x=1183\sqrt{2x} - 1 = 0 \quad \Rightarrow \quad 3\sqrt{2x} = 1 \quad \Rightarrow \quad \sqrt{2x} = \frac{1}{3} \quad \Rightarrow \quad 2x = \frac{1}{9} \quad \Rightarrow \quad x = \frac{1}{18} So, the x-intercept is (118,0)\left( \frac{1}{18}, 0 \right).

  • y-intercept: Set x=0x = 0: f(0)=301=1f(0) = 3\sqrt{0} - 1 = -1 So, the y-intercept is (0,1)(0, -1).

4. Domain:

The domain is determined by the square root function, where the expression inside the square root must be non-negative: 2x0x02x \geq 0 \quad \Rightarrow \quad x \geq 0 Thus, the domain is [0,)[0, \infty).

5. Range:

The range is based on the transformation:

  • The square root function x\sqrt{x} has a range of [0,)[0, \infty).
  • The vertical transformation 32x13\sqrt{2x} - 1 shifts the graph down by 1, so the minimum value is 1-1. Thus, the range is [1,)[-1, \infty).

6. End Behavior:

  • As xx \to \infty, ( f(x) \to \infty \

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Math Problem Analysis

Mathematical Concepts

Functions
Transformations
Square Root Function

Formulas

f(x) = 3√(2x) - 1

Theorems

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Suitable Grade Level

Grades 10-12