Cubic polynomials, represented by x3, have their unique properties and curve when compared to the familiar quadratic polynomials, with a degree of two and a bell-shaped curve. This is because according to the Fundamental Theorem of Algebra, cubic polynomials have at least three roots, making them more complex than quadratic polynomials. In this lesson, we will delve into the characteristics of cubic polynomials and learn how to graph them effectively.
Understanding Cubic Polynomials: Definitions and Standard Form
Before we dive into graphing, let's establish some fundamental definitions. A cubic polynomial is a polynomial with a degree of three, in the standard form of y = ax3 + bx2 + cx + d, where a, b, c, and d are constants with a ≠ 0. The graphical representation of this equation is known as the graph of a cubic polynomial.
Comparing Cubic and Quadratic Graphs
Before we explore the graphing techniques for cubic polynomials, it is essential to note the distinctions between cubic and quadratic graphs. While a parabola (curve) has a vertical line as its axis of symmetry, dividing it into two identical halves, its point of symmetry is the central point where the curve divides into equal parts facing in different directions.
Graphing Cubic Polynomials Using Three Different Techniques
There are three methods we can use to graph cubic polynomials: transformation, factorization, and constructing a table of values. Let's take a closer look at each technique with some examples to demonstrate how they work.
Transformation Method
In geometry, transformation refers to a change in shape, and this concept can be applied to graph plotting by adjusting the coefficients or constants in a given cubic polynomial to modify the shape of the curve. For instance, the graph of the basic cubic function, y = x3, is depicted below:
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