p = R - C
= 5 x^2 + 19 x - 10
where is that zero?
solve quadratic
x = [ -19 +/- sqrt (361+200) ]/10
= [ -19 +/- 23.7 ]/10
= .469 thousand = 469
Kool Klothes has determined that the revenue function for selling x thousand pairs of shorts is R(x)=-5x^2 + 21x. The cost function C(x) =2x +10 is the cost of producing the shorts.
Write a profit Fumction
How many pairs of shorts must the company sell in order to break even
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