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i already know the domain just need help with the range

have you learned about completing the square?

Yes

wait you got x you said right?

\[x=y^2-8y+7\]

And yes

I was taught to substitute the x for the y and vice vera

@jim_thompson5910 can't he use substitution?

@JacksonJRB you're thinking of the inverse

Ah

first compute h = -b/(2a)
in this case, a = 1, b = -8

once you know the value of h, plug it into y=x^2-8x+7 to find k

`can't he use substitution?`
I'm not sure what you mean @GTA_Hunter35

he said he has x

He said he had the domain. Not just a single value of x.

nvm it won't work

^^

^_^

its your call @jim_thompson5910

I'm still very confused...

were you able to compute h = -b/(2a) ?

do you want to complete the square or find the zeros or use the vertex formula?

what value did you get for h

wait wats the vertex formula?

And either way @freckles

h=4

well if you find the average of the zeros you will find the x-coordinate of the vertex

plug x = 4 into y=x^2-8x+7 and you get y = ??

nevermind you guys got the x-coordinate of the vertex

-9

Ah. That makes sense now. Thank you so much!

no problem

well ur right too but u used the function way

used the function way?

u used f of x

dat was the only difference

k