Math Problem Statement

Graph f(x) = x^3 + 4x^2 - 5 by using a table of values.

Solution

The task in the image is to graph the function f(x)=x3+4x25f(x) = x^3 + 4x^2 - 5 by using a table of values.

Steps:

  1. Create a table of values by choosing some xx-values and calculating the corresponding f(x)f(x)-values. Let's choose x=4,2,0,2,4x = -4, -2, 0, 2, 4 based on the grid provided.

  2. Calculate the values of the function: f(x)=x3+4x25f(x) = x^3 + 4x^2 - 5 For each xx, substitute the value into the function:

    • When x=4x = -4: f(4)=(4)3+4(4)25=64+645=5f(-4) = (-4)^3 + 4(-4)^2 - 5 = -64 + 64 - 5 = -5
    • When x=2x = -2: f(2)=(2)3+4(2)25=8+165=3f(-2) = (-2)^3 + 4(-2)^2 - 5 = -8 + 16 - 5 = 3
    • When x=0x = 0: f(0)=(0)3+4(0)25=5f(0) = (0)^3 + 4(0)^2 - 5 = -5
    • When x=2x = 2: f(2)=(2)3+4(2)25=8+165=19f(2) = (2)^3 + 4(2)^2 - 5 = 8 + 16 - 5 = 19
    • When x=4x = 4: f(4)=(4)3+4(4)25=64+645=123f(4) = (4)^3 + 4(4)^2 - 5 = 64 + 64 - 5 = 123
  3. Plot the points on the graph: The points you can plot are: (4,5),(2,3),(0,5),(2,19),(4,123)(-4, -5), (-2, 3), (0, -5), (2, 19), (4, 123)

  4. Sketch the graph: After plotting these points, you will draw a smooth curve passing through them, noting that this is a cubic function. The shape of a cubic function usually includes a turning point, and it goes to negative infinity as xx \to -\infty and positive infinity as x+x \to +\infty.

Would you like me to generate the graph for you or explain further details about this? Here are some follow-up questions that can deepen your understanding:

  1. How do cubic functions typically behave for large positive and negative values of xx?
  2. Why do we include turning points when sketching cubic functions?
  3. What are the general characteristics of the graph of a polynomial of degree 3?
  4. How would you determine the turning points or local minima/maxima of this cubic function?
  5. What is the significance of the leading term x3x^3 in determining the graph's overall shape?

Tip: For polynomial functions, the degree of the leading term gives important information about the general shape of the graph.

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Math Problem Analysis

Mathematical Concepts

Algebra
Cubic Functions
Graphing

Formulas

f(x) = x^3 + 4x^2 - 5

Theorems

General behavior of cubic functions

Suitable Grade Level

Grades 9-12