In ABC, AB = (2 x) cm, BC = (x + 1) cm and ABC =
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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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Edexcel AS And A Level Mathematics Pure Mathematics Year 1/AS
ISBN: 9781292183398
1st Edition
Authors: Greg Attwood
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