If the cost, $\displaystyle C(x)$, for manufacturing $\displaystyle x$ units of a certain product is given by $\displaystyle C(x)=x^2-60x+13500$, find the number of units manufactured at a cost of $17500.
Basically it's asking how many units you manufactured if it costed you $17500, i.e. C(x) = 17500:
$\displaystyle 17500 = x^{2} - 60x + 13500$
$\displaystyle 0 = x^{2} - 60x - 4000$
Solve the quadratic and take the solution that makes most sense.
If the cost, $\displaystyle C(x)$, for manufacturing $\displaystyle x$ units of a certain product is given by $\displaystyle C(x)=x^2-60x+13500$, find the number of units manufactured at a cost of $17500.
Solve $\displaystyle 17500 = x^2 - 60x + 13500 \Rightarrow 0 = x^2 - 60x - 4000$ and round to the whole number you think best answers the question ......