QUESTION IN DESCRIPTION!!!!

Question

The profit, P earned by a small business each year can be modeled to fit the polynomial function P(y)=10y^3-50y^2+20y+100,000, where y is the number of years since 1990. Did the company's profits increase or decrease in 1995 compared to 1994?

Answer 1

Note that in Mark's answer,

 

If     P(5) - P(4)       is positive, then profits increased in 1995 compared to 1994.

If     P(5) - P(4)       is negative, then profits decreased in 1995 compared to 1994.

 

 

Understand why?

Answer 2

P(4) = 10(4³) - 50(4²) + 20(4) + 100000

P(5) = 10(5³) - 50(5²) + 20(5) + 100000

P(5) - P(4) = 10(5³ - 4³) - 50(5² - 4²) + 20(5 - 4) 

P(5) - P(4) = 10(61) - 50(9) + 20

 

Can you finnish?