Question: In ABC, AB = (2 x) cm, BC = (x + 1) cm and ABC = 120. a. Show that AC 2 = x

In △ABC, AB = (2 − x) cm, BC = (x + 1) cm and ∠ABC = 120°.

a. Show that AC2 = x2 − x + 7.

b. Find the value of x for which AC has a minimum value.

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