Question 885594
Same as {{{y=4x^2+5x=x(4x+5)}}}.
Roots are {{{-5/4}}} and {{{0}}}.
Vertex occurs exactly in the middle of the roots for x, which is at {{{x=-5/8}}}.  This will be a minimum point for y, because the coefficient on {{{x^2}}} is positive.


The vertex will indicate your range.


Use x=0 to find the y intercept