Graph each function. See Examples 1 and 2. g(x) = 2x²

검증된 단계별 안내

Recognize that the function given is a quadratic function of the form \(g(x) = 2x^{2}\), which is a parabola opening upwards because the coefficient of \(x^{2}\) is positive.

Identify the vertex of the parabola. Since the function is in the form \(g(x) = ax^{2} + bx + c\) with \(a=2\), \(b=0\), and \(c=0\), the vertex is at the origin \((0,0)\).

Create a table of values by choosing several \(x\)-values (both positive and negative), then calculate the corresponding \(g(x)\) values using the formula \(g(x) = 2x^{2}\).

Plot the points from the table on the coordinate plane. Because the parabola is symmetric about the y-axis, points with \(x\) and \(-x\) will have the same \(g(x)\) value.

Draw a smooth curve through the plotted points to complete the graph of \(g(x) = 2x^{2}\), ensuring the parabola opens upwards and is narrower than the graph of \(y = x^{2}\) due to the coefficient 2.

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주요 개념

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Understanding Quadratic Functions

A quadratic function is a polynomial of degree two, typically written as f(x) = ax² + bx + c. Its graph is a parabola, which opens upward if a > 0 and downward if a < 0. In g(x) = 2x², the coefficient 2 affects the parabola's width and direction.

Graphing Parabolas

Graphing a parabola involves plotting points by substituting x-values into the function and finding corresponding y-values. The vertex of g(x) = 2x² is at the origin (0,0), and the parabola is symmetric about the y-axis. Understanding this symmetry helps in sketching the graph accurately.

Effect of the Leading Coefficient on the Graph

The leading coefficient (the number before x²) determines the parabola's width and direction. For g(x) = 2x², the coefficient 2 makes the parabola narrower than the standard x² graph, indicating a steeper curve. Larger coefficients compress the graph vertically, while smaller ones stretch it.