Question 297166
What the fuck is the vertex of x^2-3x-21
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My, what language!

{{{y=x^2-3x-21}}}

Use the vertex formula:

1.  The x-coordinate of the vertex of {{{ax^2+bx+c}}} is found by
evaluating {{{-b/(2a)}}}
2.  The y-coordinate of the vertex is found by substituting the 
x-coordinate of the vertex into {{{ax^2+bx+c}}}

In your problem {{{a=1}}}, {{{b=-3}}}, {{{c=-21}}}.

Follow the above rules and you'll find that the x-coordinate of the 
vertex is {{{3/2}}} and the y-coordinate of it is {{{-93/4}}} 

Edwin</pre>