SOLUTION: The profit on a watch is given by P = x2 – 13x – 80, where x is the number of watches sold per day. How many watches were sold on a day when there was a $50 loss?

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: The profit on a watch is given by P = x2 – 13x – 80, where x is the number of watches sold per day. How many watches were sold on a day when there was a $50 loss?      Log On


   

Question 58910: The profit on a watch is given by P = x2 – 13x – 80, where x is the number of watches sold per day. How many watches were sold on a day when there was a $50 loss?
Answer by asha(30) About Me  (Show Source):
You can put this solution on YOUR website!
the equation when there is loss of 50$ is
x2-13x-80=-50
x2-13x-80+50=-50+50
x2-13x-30=0
x2-15x+2x-30=0
x(x-15)+2(x-15)=0
(x-15)(x+2)=0
the answer is x=15 as the no. of watches cannot benegative.
the no.of watches sold on the day there is aloss of 50$ is 15.