Question 1094361
.
For example, this quadratic inequality


(x-4)*(x-12) >= 0.



The parabola  f(x) = (x-4)*(x-12) is shown in the plot below:



{{{graph( 330, 330, -5.5, 20.5, -20.5, 20.5,
          (x-4)*(x-12)
)}}}


Plot y = (x-4)*(x-12)