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Ch. 1 - Equations and Inequalities
Blitzer - College Algebra 8th Edition
Blitzer8th EditionCollege AlgebraISBN: 9780136970514Not the one you use?Change textbook
All textbooksBlitzer 8th EditionCh. 1 - Equations and InequalitiesProblem 13a
Chapter 2, Problem 13a

Graph each equation in Exercises 13 - 28. Let x = - 3, - 2, - 1, 0, 1, 2, 3
y = x2 - 2

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Step 1: Understand the equation. The given equation is y = x^2 - 2. This is a quadratic equation, which represents a parabola that opens upwards because the coefficient of x^2 is positive.
Step 2: Create a table of values. Substitute the given x-values (-3, -2, -1, 0, 1, 2, 3) into the equation y = x^2 - 2 to calculate the corresponding y-values. For example, when x = -3, y = (-3)^2 - 2 = 9 - 2 = 7.
Step 3: Plot the points. Use the x-values and their corresponding y-values to create ordered pairs (x, y). For example, one point is (-3, 7). Repeat this for all x-values to get the full set of points.
Step 4: Draw the graph. Plot the points from the table on a coordinate plane. Since the equation is quadratic, the points will form a parabolic shape. Connect the points smoothly to complete the graph.
Step 5: Analyze the graph. The vertex of the parabola is at the lowest point (minimum) because the parabola opens upwards. The axis of symmetry is the vertical line x = 0, and the y-intercept is the point where the graph crosses the y-axis (x = 0, y = -2).

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Quadratic Functions

A quadratic function is a polynomial function of degree two, typically expressed in the form y = ax^2 + bx + c. The graph of a quadratic function is a parabola, which can open upwards or downwards depending on the sign of the coefficient 'a'. Understanding the shape and properties of parabolas is essential for graphing quadratic equations.
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Vertex of a Parabola

The vertex of a parabola is the highest or lowest point on the graph, depending on its orientation. For the function y = x^2 - 2, the vertex can be found at the point (0, -2), which is derived from the standard form of the quadratic equation. The vertex plays a crucial role in determining the graph's symmetry and direction.
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Graphing Points

Graphing points involves plotting specific values of x and their corresponding y values on a coordinate plane. In this case, substituting x values from -3 to 3 into the equation y = x^2 - 2 allows us to find the corresponding y values, which can then be plotted to visualize the quadratic function. This process is fundamental for accurately representing the function's behavior.
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Related Practice
Textbook Question

Find each product and write the result in standard form. (7 - 5i)(- 2 - 3i)

Textbook Question

Solve each equation in Exercises 15–34 by the square root property. 3x2=273x^2 = 27

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Textbook Question

Graph each equation in Exercises 13 - 28. Let x = - 3, - 2, - 1, 0, 1, 2, 3

y = x2 + 2

Textbook Question

Solve each radical equation in Exercises 11–30. Check all proposed solutions. √(x + 3) = x - 3

Textbook Question

Solve each equation in Exercises 1 - 14 by factoring. 10x - 1 = (2x + 1)2

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In Exercises 1–26, solve and check each linear equation. 7x + 4 = x + 16

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