Ch. 5 - Complex Numbers, Polar Coordinates and Parametric Equations

Blitzer3rd EditionTrigonometryISBN: 9780137316601Non è quello che usi tu?Cambia libro di testo

Blitzer 3rd Edition

Ch. 5 - Complex Numbers, Polar Coordinates and Parametric Equations

Problema 5.5.61

Capitolo 5, Problema 5.5.61

In Exercises 59–62, sketch the plane curve represented by the given parametric equations. Then use interval notation to give each relation's domain and range. x = t² + t + 1, y = 2t

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Identify the parametric equations given: \(x = t^{2} + t + 1\) and \(y = 2t\). These describe the coordinates \((x, y)\) in terms of the parameter \(t\).

To sketch the curve, first consider the domain of \(t\). Since \(t\) is a real number parameter, its domain is \((-\infty, \infty)\).

Express \(t\) in terms of \(y\) from the second equation: \(y = 2t \implies t = \frac{y}{2}\). This substitution will help us find the relation between \(x\) and \(y\).

Substitute \(t = \frac{y}{2}\) into the equation for \(x\): \(x = \left(\frac{y}{2}\right)^{2} + \frac{y}{2} + 1 = \frac{y^{2}}{4} + \frac{y}{2} + 1\). This gives the Cartesian form of the curve.

Analyze the domain and range of \(x\) and \(y\): since \(t\) ranges over all real numbers, \(y = 2t\) also ranges over \((-\infty, \infty)\). For \(x\), because it is a quadratic expression in \(t\), determine its minimum value by completing the square or using vertex formula to find the range of \(x\).

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Parametric Equations

Parametric equations express the coordinates of points on a curve as functions of a parameter, often denoted as t. Instead of y as a function of x, both x and y depend on t, allowing the representation of more complex curves and motions.

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Parameterizing Equations

Domain and Range in Parametric Form

The domain refers to all possible values of the parameter t for which the parametric equations are defined. The range consists of all possible output values of x and y generated by those t values. Interval notation is used to express these sets clearly.

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Domain and Range of Function Transformations

Sketching Parametric Curves

To sketch a parametric curve, calculate points by substituting values of t into the equations, then plot the corresponding (x, y) points. Understanding how x and y change with t helps visualize the shape and direction of the curve.

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Introduction to Parametric Equations

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