Math Problem Statement

Find all x- and y-intercepts of the graph of f left parenthesis x right parenthesis equals short dash 2 vertical line x minus 3 vertical line plus 8.

Solution

We are given the function f(x)=2x3+8f(x) = -2 |x - 3| + 8, and we need to find its x- and y-intercepts.

1. Finding the y-intercept:

The y-intercept occurs where x=0x = 0. So, we substitute x=0x = 0 into the function and solve for f(0)f(0).

f(0)=203+8f(0) = -2 |0 - 3| + 8 f(0)=23+8=2(3)+8=6+8=2f(0) = -2 | -3 | + 8 = -2(3) + 8 = -6 + 8 = 2

Thus, the y-intercept is (0,2)(0, 2).

2. Finding the x-intercepts:

The x-intercepts occur where f(x)=0f(x) = 0. So, we set the function equal to zero and solve for xx.

0=2x3+80 = -2 |x - 3| + 8 2x3=8-2 |x - 3| = -8 x3=4|x - 3| = 4

Now, we solve the absolute value equation: x3=4orx3=4x - 3 = 4 \quad \text{or} \quad x - 3 = -4

Solving both cases: x=4+3=7orx=4+3=1x = 4 + 3 = 7 \quad \text{or} \quad x = -4 + 3 = -1

Thus, the x-intercepts are x=7x = 7 and x=1x = -1. Therefore, the x-intercepts are (7,0)(7, 0) and (1,0)(-1, 0).

Summary:

  • y-intercept: (0,2)(0, 2)
  • x-intercepts: (7,0)(7, 0) and (1,0)(-1, 0)

Would you like more details on any part of the process or have any other questions?

Here are five related questions you might consider:

  1. How do you graph a function involving absolute value, like f(x)=2x3+8f(x) = -2 |x - 3| + 8?
  2. What transformations occur in the graph of f(x)=x3f(x) = |x - 3|?
  3. How do you solve absolute value equations generally?
  4. What is the vertex of the graph of f(x)=2x3+8f(x) = -2 |x - 3| + 8?
  5. How do the x- and y-intercepts help in sketching the graph of a function?

Tip: Absolute value functions create V-shaped graphs, and the turning point (vertex) occurs where the expression inside the absolute value is zero.

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Math Problem Analysis

Mathematical Concepts

Absolute Value Functions
Graphing Intercepts
Piecewise Functions

Formulas

y-intercept: f(0)
x-intercepts: set f(x) = 0 and solve for x
Absolute value equation |x - 3| = 4

Theorems

Absolute Value Properties
Solving Absolute Value Equations

Suitable Grade Level

Grades 9-11