A shopkeeper sells a pen for 3x² + 10x+5. if the profit is x²- x +2. What is the cost of pen
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Price of pen = 3x² + 10x+5
Profit = x²- x +2
Cost = (3x² + 10x+5) - (x²- x +2)
=2x²+9x+7
Therefore cost of the pen is 2x²+9x+7
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