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Precalculus Mathematics Homework Help
Solving Triangle ABC: Finding Value of x
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[QUOTE="Natasha1, post: 5335395, member: 41525"] [h2]Homework Statement [/h2] In triabgle ABC, AB = 2x cm, AC = x cm, BC = 21 cm and angle BAC = 120 degrees. Calculate the value of x? [h2]Homework Equations[/h2] I used the cosine rule here [h2]The Attempt at a Solution[/h2] As we have 2 sides and an angle I used the cosine rule - Am I correct? (2) means squared b(2) = a(2) + c(2) - 2ac cos B so x(2) =21(2) + (2x)(2) - 2.21.2x.c cos B x(2) =441 + 4x(2) - 84x cos B 3x(2) = 84x cosB - 441 How do I find x from here? [/QUOTE]
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Precalculus Mathematics Homework Help
Solving Triangle ABC: Finding Value of x
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