Question

What is the vertex of the graph y=x^2-11x+28

Answer 1

use
\[-\frac{b}{2a}\] with
\[a=1,b=-11\] to get
\[\frac{11}{2}\]

Answer 2

that is first coordinate. second is what you get when you replace x by 11/2

Answer 3

i get
\[-\frac{9}{4}\] so vertex is
\[(\frac{11}{2},-\frac{9}{4})\]

Answer 4

No , the options are (-7,-4) and (.5.5,2.25)