Math Problem Statement

What is the equation y = x^2 + 2|x|, and how does it behave?

Solution

The equation in the image is:

y=x2+2xy = x^2 + 2|x|

This equation combines two components:

  1. x2x^2: a parabolic term that is always non-negative.
  2. 2x2|x|: an absolute value term multiplied by 2, which ensures symmetry about the yy-axis and adds a linear effect.

Key Observations:

  1. Symmetry: The function is symmetric about the yy-axis because both x2x^2 and x|x| are even functions.
  2. Shape of the graph:
    • For x0x \geq 0, x=x|x| = x, so the equation simplifies to y=x2+2xy = x^2 + 2x.
    • For x<0x < 0, x=x|x| = -x, so the equation simplifies to y=x22xy = x^2 - 2x.
  3. Smoothness: The graph will have no breaks but will show a “bend” where x=0x = 0 due to the absolute value term.

Would you like me to graph this equation or explain further details? Here are some additional related questions for you:

  1. What does the symmetry about the yy-axis imply?
  2. How does the absolute value term x|x| influence the graph’s behavior?
  3. How can we determine the vertex of this graph?
  4. What are the differences between this graph and the standard parabola y=x2y = x^2?
  5. How would you sketch this function step by step?

Tip: Remember that the absolute value function causes changes in slope depending on the sign of xx.

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Math Problem Analysis

Mathematical Concepts

Quadratic Functions
Absolute Value
Symmetry
Graph Behavior

Formulas

y = x^2 + 2|x|
Absolute Value Definition |x|

Theorems

Properties of Even Functions
Vertex of a Parabola

Suitable Grade Level

Grades 9-11