Question

plz solve ......this question​

Answer 1

Answer:

Resultant R² = a² + b² + 2ab cos 60°

[√7*b]² = a² + b² + ab

7 b² - b² = a² +ab

6 b² - a² = ab

6 (b/a) - (a/b) = 1

6t - 1/t = 1

6 t² -t -1 = 0

(3t+ 1) ( 2t -1) = 0

Hence t = -1/3 or 1/2

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