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Q.

In ΔABC, a = 4 b = 3 A=60° then C is root of equation 

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a

C2−3C−7=0

b

C2+3C−7=0

c

C2+3C+7=0

d

C2−3C+7=0

answer is A.

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Detailed Solution

a2=b2+c2−2bccosA 16=9+C2−2×3×C12 C2−3C−7=0

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