Question 23343
Solve the equality 1.5x-10x^2=0
Multiply by 10 to get"
15x- 100x^2=0
Factor to get x(15 - 100x)=0
x=0 or x= 0.15
Plot these two value on a number line thus forming three 
intervals: x<0, 0<x<0.15, x>0.15
Check a value in each of these intervals to see if all
values in the interval are and or not part of the solution
to the inequality.
For example:  
If =-10 you get  1.5(-10)-10(-10)^2<0 ?
-15-1000<0  This is true so all x values
less than 0 are part of the solution.
Do the same for x = 0.15/2 and x=10

The same procedure should be followed on your
other posted problems.

Cheers,
Stan H>

Cheers,
S