24cm
20cm
28cm
7cm
887
Correct answer is A
< B is the largest since the side facing it is the largest, i.e. (x + 4)cm
Cosine B = 15
= 0.2 given
b2 - a2 + c2 - 2a Cos B
Cos B = a2+c2−b22ac
15 = x2+?(x−4)2−(x+4)22x(x−4)
15= x(x−16)2x(x−4)
15 = x−162x−8
= 5(x - 16)
= 2x - 8
3x = 72
x = 723
= 24
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