3)From the corners of a square card board of side 18 cm ,squares of si – InterviewSolution

1.	3)From the corners of a square card board of side 18 cm ,squares of side x are cut out and the edges are-thenturnedupsoastofornan open box.EindthevalueofLIfthe volume ofthe boxis maximumAns : f(x)= 4(x3-18x + 81 x)& f has maximum at x = 3
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