A drugstore that sells a certain brand of Vitamin C tablets predicts that their profit P can be modeled by the polynomial function P(a) = -50a3 + 2400a2 – 2000, where a is the amount spent on advertising (in thousands of pesos). What is its profit if a = 16?

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.