Suppose a monopolist has TC = 100 + 10Q + 20Q 2 , and the demand curve it faces is p=90-2Q. What will be the price, quantity, and profit for this

Suppose a monopolist has TC = 100 + 10Q + 20Q2, and the demand curve it faces is p=90-2Q. What will be the price, quantity, and profit for this firm?

Wondering what the answer is and how I would go about figuring it out myself. Thanks!

 
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