SOLUTION: Would someone show me step by step how to figure this problem. Please. Thank You. The profit on a watch is given by P=x^2-13x-80, where x is the number of watches sold per day.

Question 83917: Would someone show me step by step how to figure this problem. Please. Thank You.
The profit on a watch is given by P=x^2-13x-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 jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
If there was a $50 loss, then

Plug in . Now lets solve for x

Add 50 to both sides

Combine like terms

Factor the expression

or Set each factor equal to zero

or Solve for x in each case

Since you cannot sell -2 watches, the number of watches sold was 15
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