precalculus
posted by Sara on .
x/4x+1 < 5x/6 solve the inequality answer in interval notation and show work  thanks

I will assume you meant
x/(4x+1) < 5x/6
times 6(4x+1)
6x < 20x^2 + 5x
20x^2  x > 0
x(20x  1) > 0
critical values: x = 0, x = 1/20 and of course x ≠ 1/4
try values in the intervals
1. x < 1/4, say x = 1
is 1/3 < 5/6 ? , is 1/3 < 5/6 ? NO
2. between 1/4 and 0, say x = .2
is .2/.2 < 1/6 ? , is 1 <  1/6 ? YES
3. between 0 and 1/20, say x = .01
is .01/1.04 < .05/6 ? , is .0096.. < .00833 ? , NO
4. greater than 1/20, say x = 1
is 1/5 < 5/6 ? Yes
So 1/4 < x < 0 OR x > 1/20
check my arithmetic 
Poswt it.