每日一题

Mathematics

An electronics company uses the quadratic function below to model its profit P(x), in dollars, from the sale of x units of smartphones.
P(x)=-0.05x^2+1000x
Which of the following equivalent expressions displays the number of units that must be sold to maximize profit as a constant or coefficient?

A.-0.05(x^2-20000x)
B.-0.05(x-10000)^2+50000
C.-0.05x(x-20000)
D.-0.05(x^-5000x)+750x

答案和解析

答案：B

解析：

Choice B is correct.