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Ch. 6 - Inverse Circular Functions and Trigonometric Equations
Lial - Trigonometry 12th Edition
Lial12th EditionTrigonometryISBN: 9780136552161, 9780135440780, 9780136881117, 9780135440827, 9780135924891Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoLial 12th EditionCh. 6 - Inverse Circular Functions and Trigonometric EquationsProblema 6.2.41
Capitolo 7, Problema 6.2.41

Solve each equation over the interval [0°, 360°). Write solutions as exact values or to the nearest tenth, as appropriate.
tan² θ + 4 tan θ + 2 = 0

Guida verificata passo dopo passo
1
Start by recognizing that the given equation is a quadratic in terms of \(\tan \theta\): \(\tan^{2} \theta + 4 \tan \theta + 2 = 0\).
Use the quadratic formula to solve for \(\tan \theta\). Recall the quadratic formula: \(x = \frac{-b \pm \sqrt{b^{2} - 4ac}}{2a}\), where \(a=1\), \(b=4\), and \(c=2\) in this case.
Calculate the discriminant \(\Delta = b^{2} - 4ac = 4^{2} - 4 \times 1 \times 2\) and then find the two possible values for \(\tan \theta\) using the quadratic formula.
Once you have the two values for \(\tan \theta\), find the corresponding angles \(\theta\) by taking the arctangent (inverse tangent) of each value. Remember to consider the interval \([0^\circ, 360^\circ)\) and the periodicity and sign of the tangent function to find all solutions within this interval.
Write the solutions for \(\theta\) either as exact values (if they correspond to special angles) or rounded to the nearest tenth of a degree, as appropriate.

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Solving Quadratic Equations

The given equation is quadratic in terms of tan θ, so solving it involves using methods like factoring, completing the square, or the quadratic formula to find values of tan θ that satisfy the equation.
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Percorso guidato
6:24
Solving Quadratic Equations by Completing the Square

Properties of the Tangent Function

Understanding the tangent function's behavior, including its period of 180°, domain restrictions, and how to interpret solutions for θ within the interval [0°, 360°), is essential for finding all valid angle solutions.
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Introduction to Tangent Graph

Inverse Tangent and Angle Solutions

After finding values for tan θ, use the inverse tangent function to determine θ. Since tangent is periodic, consider all angles in [0°, 360°) that correspond to the solutions, adjusting for the function's periodicity.
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Inverse Tangent
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