If $x + 2y= 4$ and $xy = -8$, what is the value of $x^2 + 4y^2$?
Question:
If $x + 2y= 4$ and $xy = -8$, what is the value of $x^2 + 4y^2$?
Answer:
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If $x + 2y= 4$ and $xy = -8$, what is the value of $x^2 + 4y^2$?
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