Question

For what values of x is the graph of y= 2/5-x concave upward?

Answer 1

@TrojanPoem

Answer 2

@kaylaprincess

Answer 3

y = 2(5-x)^-1

y' = -2(x-5)^-2 * -1 = 2(x-5)^-2

y'' = -4(x-5)^-3

when y'' is undefined

x-5 = 0
x = 5