# math

posted by .

f(x)=x^2+x^2-8

a. what is the vertex (h,k) of f?

b. what is the axis of symmetry?

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a. (0,-8) is the vertex

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b. axis of symmetry is zero.

• check - math -

I have a feeling there is a typo.
Why would anybody have two like terms in the equation ?

should it be
f(x) = x^2 + 2x - 8 ????

• math -

Yes, Reiny you caught the typo

It should read f(x)=x^2+2x-8, thank you for catching that. So, now my answers will change that Riana gave. Right?

• math -

yes,
complete the square ....

f(x) = x^2 + 2x +1 - 1 -8
= (x+1)^2 - 9

vertex is (-1,-9)
axis of symmetry: x = -1 or x+1 = 0

• math -

and axis will be -1

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the vertex can't be (-1,-9) its incorrect.

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• math -

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