In Exercises 60–63, begin by graphing the standard quadratic function, f(x) = x2. Then use transformations of this graph to graph the given function. r(x) = -(x + 1)2

Ch. 2 - Functions and Graphs

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Blitzer 8th Edition

Ch. 2 - Functions and Graphs

문제 62

3장, 문제 62

In Exercises 60–63, begin by graphing the standard quadratic function, f(x) = x². Then use transformations of this graph to graph the given function. r(x) = -(x + 1)²

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Start by recalling the graph of the standard quadratic function \(f(x) = x^2\). This is a parabola opening upwards with its vertex at the origin \((0,0)\).

Identify the given function \(r(x) = -(x + 1)^2\). Notice that it is a transformation of \(f(x) = x^2\).

Recognize the transformations: the expression \((x + 1)\) inside the squared term indicates a horizontal shift. Specifically, \(x + 1\) means the graph shifts 1 unit to the left.

The negative sign in front of the squared term, \(- (x + 1)^2\), reflects the graph over the x-axis, changing the parabola to open downwards instead of upwards.

Combine these transformations: start with the graph of \(f(x) = x^2\), shift it 1 unit left, then reflect it over the x-axis to get the graph of \(r(x) = -(x + 1)^2\).

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주요 개념

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Standard Quadratic Function

The standard quadratic function is f(x) = x², which graphs as a parabola opening upwards with its vertex at the origin (0,0). It serves as the base graph for understanding transformations applied to quadratic functions.

Graph Transformations

Graph transformations involve shifting, reflecting, stretching, or compressing the base graph. For example, adding or subtracting inside the function shifts the graph horizontally, while multiplying by a negative reflects it across the x-axis.

Reflection Across the x-axis

Multiplying a function by -1 reflects its graph across the x-axis, flipping it upside down. For r(x) = -(x + 1)², this means the parabola opens downward instead of upward.