Math Problem Statement

Is y = x^3 - 1 a function? Graph the following points.

Solution

The equation given is y=x31y = x^3 - 1. To interpret this:

  1. Equation Analysis: This equation describes a cubic function. For each value of xx, the output yy is determined by cubing xx and subtracting 1.

  2. Table of Values: The table provided shows the following pairs of values:

    x & y \\ \hline 2 & 7 \\ 1 & 0 \\ 0 & -1 \\ -1 & -2 \\ -2 & -9 \\ \end{array}$$ These values are correct based on the equation: $$y = x^3 - 1$$ For example: - For $$x = 2$$: $$y = 2^3 - 1 = 8 - 1 = 7$$ - For $$x = 1$$: $$y = 1^3 - 1 = 1 - 1 = 0$$ - For $$x = 0$$: $$y = 0^3 - 1 = 0 - 1 = -1$$ - For $$x = -1$$: $$y = (-1)^3 - 1 = -1 - 1 = -2$$ - For $$x = -2$$: $$y = (-2)^3 - 1 = -8 - 1 = -9$$
  3. Graphing the Function: The blank grid on the left can be used to plot the points (x,y)(x, y) from the table: (2,7),(1,0),(0,1),(1,2),(2,9)(2, 7), (1, 0), (0, -1), (-1, -2), (-2, -9) You would mark these points on the grid and connect them to show the cubic curve.

  4. Is this a function?: Yes, this is a function. Each value of xx corresponds to exactly one value of yy, meaning it passes the vertical line test (a vertical line would intersect the graph at only one point).

Would you like a more detailed explanation or help with graphing?


Additional Questions:

  1. What is the general shape of a cubic function on a graph?
  2. How does the vertical line test work to determine if something is a function?
  3. Can a function have the same output for different inputs?
  4. How would the graph of y=x31y = x^3 - 1 differ from y=x3y = x^3?
  5. What is the significance of the constant term 1-1 in the equation y=x31y = x^3 - 1?

Tip:

When graphing cubic functions, note that they usually have an "S" shape, with one end going to positive infinity and the other to negative infinity.

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Math Problem Analysis

Mathematical Concepts

Cubic functions
Graphing
Algebra

Formulas

y = x^3 - 1

Theorems

Vertical line test

Suitable Grade Level

Grades 9-12