Question

How would you put this into Vertex Form: y=x^2 +4x?

Answer 1

complete the square

Answer 2

How, if there isn't a "c" value?

Answer 3

you do not need a c.
take 4 divide it by 2 and square it, what do you get?

Answer 4

4/2=2. 2^2=4.

Answer 5

ok now in math we can use zero so we will do +4-4
\[y=x^2+4x+4-4\]
\[y=(x+2)^2-4\]
your vertex is (-2,-4)

Answer 6

Okay. Thanks.