Math Problem Statement

Find a quadratic function to model the values in the table.

Find a quadratic function to model the values in the table.

Solution

To find a quadratic function that models the values in the table, we will assume the general form of a quadratic function:

y=ax2+bx+cy = ax^2 + bx + c

We will use the points provided in the table to create a system of equations and solve for aa, bb, and cc.

Points from the table:

  1. (1,3)(-1, -3)
  2. (0,3)(0, -3)
  3. (3,33)(3, 33)

We can substitute these points into the quadratic function:

  1. For (1,3)(-1, -3): 3=a(1)2+b(1)+c3=ab+c-3 = a(-1)^2 + b(-1) + c \Rightarrow -3 = a - b + c

  2. For (0,3)(0, -3): 3=a(0)2+b(0)+c3=c-3 = a(0)^2 + b(0) + c \Rightarrow -3 = c

  3. For (3,33)(3, 33): 33=a(3)2+b(3)+c33=9a+3b+c33 = a(3)^2 + b(3) + c \Rightarrow 33 = 9a + 3b + c

From equation 2, we know that c=3c = -3. Now, we can substitute c=3c = -3 into the other two equations:

  1. 3=ab3ab=0a=b-3 = a - b - 3 \Rightarrow a - b = 0 \Rightarrow a = b
  2. 33=9a+3b336=9a+3b36=12aa=333 = 9a + 3b - 3 \Rightarrow 36 = 9a + 3b \Rightarrow 36 = 12a \Rightarrow a = 3

Since a=ba = b, we also have b=3b = 3.

Thus, the quadratic function is:

y=3x2+3x3y = 3x^2 + 3x - 3

This is the quadratic function that models the values in the table.

Would you like more details on solving this system, or do you have any other questions?

Here are 5 related questions you might find helpful:

  1. How do you solve a system of equations using substitution or elimination?
  2. What is the significance of each term in a quadratic function y=ax2+bx+cy = ax^2 + bx + c?
  3. How can you determine the vertex of a quadratic function?
  4. What is the role of the discriminant in a quadratic equation?
  5. How can quadratic functions model real-world scenarios?

Tip: When modeling with quadratics, always try to use points that cover a range of values for xx to ensure an accurate fit.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Functions
Systems of Equations

Formulas

Quadratic function formula: y = ax^2 + bx + c
Substitution method for solving systems of equations

Theorems

None explicitly involved; the solution relies on basic algebraic manipulation and solving systems of equations

Suitable Grade Level

Grades 9-11