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Help me doing this question I tried this question whole day but could not find the answer

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    class 9 ncert problem?2017-02-13

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HINT.

Set $x=AC$ and use the cosine rule to get an equation for $x$.

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    But I want how to construct it I have no idea2017-02-13
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    Construct it with ruler and compass?2017-02-13
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    See here then: http://math.stackexchange.com/questions/2141127/draw-triangle-abc-in-which-ab-5-5cm-angle-c-40-circ-and-bc-ac-2-52017-02-13