Which of the following is the vertex of the function?
y = x2 - 6x + 9

(3, 0)
(-3, 36)
(4, 1)
(1, 4)

Question

Which of the following is the vertex of the function?
y = x2 - 6x + 9

    (3, 0) 
   (-3, 36) 
   (4, 1) 
   (1, 4)

jdoe0001 · Answer

you can always find the verrtex of one of those parabolas at $\bf \left(-\cfrac{b}{2a}, c-\cfrac{b^2}{4a}\right)$

zzr0ck3r · Answer

$$ax^2+bx+c\\text{then the vertex is}\\frac{-b}{2a}$$

anonymous · Answer

@mathstudent55

zzr0ck3r · Answer

what do you not understand?
what is a,b,c in your equation?

debbieg · Answer

Actually, -b/(2a) is not the vertex, it's the x-coordinate of the vertex. Then find the y coordinate by evaluating the function at that x, e.g., f(-b/(2a))=y

zzr0ck3r · Answer

right, I was gonna get to that. baby steps:)

zzr0ck3r · Answer

I should have said
the vertex is at* -b/2a

debbieg · Answer

lol... sorry @zzr0ck3r ... I always say, "If it seems like I'm being picky, it's because math is a very picky science" lol :)

zzr0ck3r · Answer

you are absolutely right