SOLUTION: b^2=8^2+9^2-2(8)(9)cos38 b^2=64+81-144cos38 When i enter this into my calculator, I get 7.47. I don't think this right. I'm having a problem evaluating cos38. What Am I doing

Algebra ->  Trigonometry-basics -> SOLUTION: b^2=8^2+9^2-2(8)(9)cos38 b^2=64+81-144cos38 When i enter this into my calculator, I get 7.47. I don't think this right. I'm having a problem evaluating cos38. What Am I doing       Log On


   

Question 186592This question is from textbook saxon algebra 2
: b^2=8^2+9^2-2(8)(9)cos38
b^2=64+81-144cos38
When i enter this into my calculator, I get 7.47. I don't think this right. I'm having a problem evaluating cos38. What Am I doing wrong? Round to the nearest tenth.
 This question is from textbook saxon algebra 2

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
I get b^2 = 31.53
and b = 5.61
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Cheers,
Stan H.