Hi everyone!

Some of the problems below are answered but I need someone to check if I'm correct but some problems are also empty and those are the ones I am having trouble with. Please help! Thank you so much.

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

a) Givef(x)in factored form.

Answer:f(x) = (x-9)(x+1)

b) Givef(x)in vertex form.

Answer:f(x) = (x-4)^2-25

c) Give the vertex off(x)and its axis of symmetry.

Answer: Not sure how to get this!

d) Doesf(x)have an absolute minimum OR an absolute maximum? What is its minimum or maximum value?

Answer: Not sure how to get this!

e) Give the interval on whichf(x)is decreasing.

Answer: Not sure how to get this!

f) What are the zeros off(x)? (its x-intercepts)

Answer:x-intercepts => (9,0) and (-1,0)

g) What is the y-intercept off(x)?

Answer:y-intercept => (0,-9)

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Please help me on the red parts =\ THANK YOU!