Question

If root a + root b+rootc=4 by 2+root 3-7. find a b c​

Answer 1

ANSWER

a=4,b=3,∠A=60

0

Using cosine rule,

cosA=

2bc

b

2

+c

2

−a

2

we have

⇒

2

1

=

6c

9+c

2

−16

⇒3c=9+c

2

−16

⇒c

2

−3c−7=0

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