Posted by Samantha on Thursday, March 15, 2012 at 6:23pm.
Hints:
Here you have two variables, and one constraint. From the constraint, y can be solved in terms of x. This value of y can then be substituted into Q to make Q a function of Q=Q(x), whose minimum value can be calculated by differentiation.
I get x=±7√2.
Check each to make sure it is a minimum or maximum.
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