Question

find the vertex
f(x)=x^2-8x+28

Answer 1

Use -b/2a

First you have to find the x in the vertex. So you should get 8/2(1) and you get 4.

Now use this 4 to put into the original equation! And you get 12.

So the vertex is (4,12)

Answer 2

ty

Answer 3

so the negative from the -b and the -8 cancel out to make a positive 8?

Answer 4

Exactly!