What is the minimum value of $z$ if $z=x^2+2y^2+6x-4y+22?$
Question:
What is the minimum value of $z$ if $z=x^2+2y^2+6x-4y+22?$
Answer:
Let's think step by step.

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What is the minimum value of $z$ if $z=x^2+2y^2+6x-4y+22?$
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