Posted by **Samantha** on Thursday, March 15, 2012 at 6:23pm.

Q. Find the minimum value of Q=x^2y subject to the constraint 2x^2+4xy=294.

Its the derivative method.

- Calculus- please help -
**MathMate**, Thursday, March 15, 2012 at 8:46pm
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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