Hello Everyone,

I would really appreciate if someone could help me with this question.

In a triangle ABC, c=7, b=8 and C=60degrees

(a) Use Cosine rule to write down a quadtratic equation involving a

(b) Hence solve it

(c) Use Sine rule to find two values of a(first find B and so A) and compare these with your answers in part(b)

I have no idea what the question really means. Any sort of help would be really appreciated

Thank you in advance