Suppose that the total profit in hundreds of dollars from selling x\displaystyle {x}x items is given by P(x)=−8x2+18x−21\displaystyle {P}{\left({x}\right)}=-{8}{x}^{{2}}+{18}{x}-{21}P(x)=−8x2+18x−21 . Find the marginal profit at x=9\displaystyle {x}={9}x=9 .
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