Question

How do i write this as a vertex form
f(x)=-7x^2+21x-9? when the vertex is -3/2 & -99/4? please help

Answer 1

the vertex of the function you have is not
\[(-\frac{3}{2},-\frac{99}{4})\]

Answer 2

yes it is

Answer 3

it is
\[(\frac{3}{2},\frac{27}{4})\]

Answer 4

thats h & k

Answer 5

oh ok. so how do i put it as a vertex form