An Aircraft factory manufactures airplane engines. The unit cost C (the cost in dollars and each airplane engine) depends on a number of engines made. If x engines are made, then the unit cost is given by the function C(x)=0.5 X² -280 X + 52506. What is the minimum unit cost?

Answer 1

you notice that C's graph is just a parabola, so its minimum is at the vertex, when x = -b/2a = 280

Don't forget your Algebra I after you've gone on to more advanced topics.

Answer 2

I still don't understand how to slove it. -
An aircraft factory manufactures airplane engines. The unit cost (the cost in dollars to make each airplane engine) depends on the number of engines made. If engines are made, then the unit cost is given by the function C(x)=1.1x^2-638x_101,067. What is the minimum unit cost?