16x^(2)-40x+6x-15=0 i already factored and this is the extended version, but i don't know where to go from here. show your work : )

If you're trying to solve for x, you need to use the quadratic formula.  
 
Plug in the numbers from the standard form of a quadratic equation  
(which is )   
 
From here, this solves down to  
 
Take the square root of 196, which is 14  
 
Now, you can solve for both the + and - variations on the equation.  
The solutions to your equation are 1.5 and 5/8 (probably)