Please help with this equation,
Use the first derivative to determine where the function
F(x)= 9x/sqrt(20x-3),,,,Increasing (if there isn't any interval, enter none .)
2. Decreasing (if there isn't any interval, enter none)
I tried, the derivative is, x=.3
or decreasing value calculator says non real number! dec (-inf,.3) is not correct .. what will be decreasing value. increasing is (.3, inf ) is correct.. from the webwork.

Question

Please help with this equation,
Use the first derivative to determine where the function 
F(x)= 9x/sqrt(20x-3),,,,Increasing (if there isn't any interval, enter none .) 
2. Decreasing (if there isn't any interval, enter none)
I tried, the derivative is,  x=.3
or decreasing value calculator says non real number! dec (-inf,.3) is not correct .. what will be decreasing value. increasing is (.3, inf ) is correct.. from the webwork.