Question

Find the vertex of the graph of the function. f(x) = 2x2 - 8x + 9

Answer 1

do you know x=-b/2a formular

Answer 2

I know it but am unsure how to use it? would b be -8 and a be 2?

Answer 3

\[x=\frac{ -(-8) }{ 2(2) }\] ??

Answer 4

\[x=\frac{ 8 }{ 4 }\]
\[x=\frac{ 4 }{ 1 }\]
\[x=4\]
would that be the vertex?

Answer 5

sorry for not coming but yeh you on the right track

Answer 6

so now put x=4 in the original equation
2(4)^2-8(4)+9

Answer 7

and the vertex is the (4,the answer above)