the Ruby Snow Company makes custom snowboards. the company's profit can be modelled with the relation y=6x^2+42x-60,where x is the number snowboards sold(in thousands) and y is the profit (in hundreds of thousands of dollars)

Question

How many snowboards does the company need to sell to maximize their profit?

The answer is 3500. But I keep getting 1350000

Answer 1

I wish I knew if you were using calculus or algebra or geometry....
But if you examine the profit function, it is a parabola that turns upward, and it only has a minimum vertex, no max. The second term should be -42 to make it work.