Math Problem Statement

Describe the opening direction of the parabolas given by the equations.

Solution

In the image, we are asked to determine the direction in which each parabola opens based on the equations provided. Let’s analyze each equation individually to confirm the answers:

  1. Equation: y=2x2+6x1y = 2x^2 + 6x - 1

    • Analysis: The coefficient of x2x^2 is +2+2, which is positive. When the coefficient of x2x^2 in a quadratic equation is positive, the parabola opens upward.
    • Answer: Upward.
  2. Equation: y=3x25x+2y = -3x^2 - 5x + 2

    • Analysis: The coefficient of x2x^2 is 3-3, which is negative. When the coefficient of x2x^2 is negative, the parabola opens downward.
    • Answer: Downward.
  3. Equation: y=(x3)25y = (x - 3)^2 - 5

    • Analysis: Expanding (x3)2(x - 3)^2 gives x2x^2 with a positive coefficient. Since the squared term x2x^2 is positive, this parabola opens upward.
    • Answer: Upward.

The solutions provided in the image are correct.

Would you like further details on any of these concepts or a breakdown of how to determine the direction for different forms of quadratic equations?

Here are some related questions that could deepen your understanding:

  1. How do we determine the vertex of a parabola given a standard form equation?
  2. What effect does the coefficient of xx in the term bxbx have on the shape or position of a parabola?
  3. How do we convert a quadratic equation from standard form to vertex form?
  4. Why does a positive leading coefficient cause a parabola to open upward?
  5. How does the value of the leading coefficient affect the width of the parabola?

Tip: Remember that the sign of the x2x^2 term (positive or negative) determines whether a parabola opens upward or downward.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Parabolas

Formulas

Quadratic form y = ax^2 + bx + c
Vertex form y = (x - h)^2 + k

Theorems

Direction of parabola based on the leading coefficient

Suitable Grade Level

Grades 8-10