Question

Find the vertex of y=x^2-6x+1 A. ( 1 , 5 ) B. ( 4 , 1 ) C. ( 2 , -3 ) D. ( 3 , -8)

Answer 1

`h=(-b)/(2a)`

`k=f(h)`

`h=(6)/(2)`

`h=3`

`k=f(3)`

`f(3)=9-18+1`

`f(3)=-8`

The vertex is
`(3,-8)`

Hope this helps.

頑張って!