# When is y = 2/(4-x) concave downwards?

1. Apr 8, 2009

### karisrou

17. For what value of x is the graph of y = 2 / (4 - x) concave downwards?

I found the first derivative = 2/(4-x)^2

And then the second 4/(4-x)^3

But I think I might have messed up somewhere in there

2. Apr 8, 2009

### futurebird

Last edited: Apr 8, 2009