The formula that we learned
where a, b, and c are constants and a not =0
The solution of the quadratic inequality
is the value of x for which y>0 ; that is ,the values of x for which the graph is above the x -axis.Visualize the shadow of the graph on the x-axis.
so we first have to factor this formula
ok, so we can get the value of x for equal to zero
and because y>0
so the part of y>0 are