Math Problem Statement

Find an equation in the form y = ax^2 + bx + c for the parabola passing through the points (-4, -98), (3, -91), (-1, 1).

Solution

To find the equation of the parabola in the form y=ax2+bx+cy = ax^2 + bx + c that passes through the given points (4,98)(-4, -98), (3,91)(3, -91), and (1,1)(-1, 1), we need to solve for the constants aa, bb, and cc.

Step 1: Set up a system of equations

Substitute each point into the general form of the quadratic equation.

  1. For (4,98)(-4, -98):
    98=a(4)2+b(4)+c    98=16a4b+c-98 = a(-4)^2 + b(-4) + c \implies -98 = 16a - 4b + c

  2. For (3,91)(3, -91):
    91=a(3)2+b(3)+c    91=9a+3b+c-91 = a(3)^2 + b(3) + c \implies -91 = 9a + 3b + c

  3. For (1,1)(-1, 1):
    1=a(1)2+b(1)+c    1=ab+c1 = a(-1)^2 + b(-1) + c \implies 1 = a - b + c

Step 2: Solve the system of equations

We now have the following system:

16a - 4b + c &= -98 \quad \text{(Equation 1)} \\ 9a + 3b + c &= -91 \quad \text{(Equation 2)} \\ a - b + c &= 1 \quad \text{(Equation 3)} \end{aligned}$$ I'll solve this system to find $$a$$, $$b$$, and $$c$$. Let's proceed with the calculation.The solution to the system of equations gives: $$a = -8, \quad b = -7, \quad c = 2$$ Thus, the equation of the parabola passing through the points $$(-4, -98)$$, $$(3, -91)$$, and $$(-1, 1)$$ is: $$y = -8x^2 - 7x + 2$$ Would you like more details about the solution, or do you have any questions? Here are five related questions to explore: 1. How can you verify that the points lie on the parabola? 2. What is the vertex of the parabola? 3. Can you derive the axis of symmetry for this quadratic function? 4. How does the discriminant help in understanding the shape of this parabola? 5. How can you express this parabola in vertex form? **Tip**: To check whether a quadratic equation is correct, substitute the given points back into the equation and ensure that both sides match.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Systems of Equations

Formulas

Quadratic equation: y = ax^2 + bx + c
Substituting points into the equation to form a system of equations

Theorems

Solving systems of linear equations
Quadratic formula

Suitable Grade Level

Grades 9-12