The area of a rectangle is represented by 12x - x² where x is a side of the rectangle. For what value of x will the area be a maximum?

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Q: Which polynomial is prime? x3 + 3x2 + 2x + 6  x3 + 3x2 – 2x – 6  10x2 – 4x + 3x + 6  10x2 – 10x +…

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