Question 89183
If the leading coefficient is positive (for instance {{{y=x^2}}}) then you will have a parabola opening up like this:

{{{ graph( 300, 200, -6, 5, -10, 10, x^2) }}}


So in this case you will have a minimum



If the leading coefficient is negative (for instance {{{y=-x^2}}}) then you will have a parabola opening down like this:

{{{ graph( 300, 200, -6, 5, -10, 10, -x^2) }}}


So in this case you will have a maximum