Question 871536
Convert to vertex form,
{{{m^2-5m-14=0}}}
{{{m^2-5m+25/4-14-25/4=0}}}
{{{(m-5/2)^2-(25+56)/4=0}}}
{{{(m-5/2)^2-81/4=0}}}
Vertex : (5/2,-81/4)
Minimum value : -81/4
No maximum value.