Trigonometric Equations Question 250
Question: If $ a=9,b=8 $ and $ c=x $ satisfies $ 3\cos C=2, $ then
[MP PET 1984]
Options:
A) $ x=5 $
B) $ x=6 $
C) $ x=4 $
D) $ x=7 $
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Answer:
Correct Answer: D
Solution:
- $ \cos C=\frac{2}{3}=\frac{81+64-x^{2}}{2.9.8}\Rightarrow x^{2}=49\Rightarrow x=7 $ .
BETA
