SOLUTION: Please help me with this. The daily profit from the sale of a product is given by{{{ P=18x-0.2x^2-97}}} dollars what is the maximum profit?

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: Please help me with this. The daily profit from the sale of a product is given by{{{ P=18x-0.2x^2-97}}} dollars what is the maximum profit?       Log On


   



Question 519666: Please help me with this. The daily profit from the sale of a product is given by+P=18x-0.2x%5E2-97 dollars what is the maximum profit?

Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
Please help me with this. The daily profit from the sale of a product is given by+P=18x-0.2x%5E2-97 dollars what is the maximum profit?
.
+P=18x-0.2x%5E2-97
reordering:
+P=-0.2x%5E2%2B18x-97
Because the coefficient associated with the x^2 term is negative, we know it is a parabola that opens downwards -- the vertex gives the max.
.
max x is at
x = -b/(2a)
x = -18/(2(-0.2))
x = -18/(-0.4)
x = 45
.
to find the max profit plug it back into:
+P=-0.2x%5E2%2B18x-97
+P=-0.2%2845%29%5E2%2B18%2845%29-97
+P=308 dollars