SOLUTION: Please help us solve for f. Original problem was {{{f(x)=x^2-9}}} We simplified this to {{{f(x)-x^2+9=0}}} but do not know were to go from here. Thank you, Keith

Question 147363: Please help us solve for f. Original problem was
We simplified this to but do not know were to go from here.
Thank you, Keith
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Do you mean solve for f(x)? The equation is already solved for f(x). I'm assuming that you want to solve for x

Start with the given equation

Plug in

Factor the right side

Now set each factor equal to zero:

or

or Now solve for x in each case

So our answers are

or

RELATED QUESTIONS
I was sick when my teacher explained this so now i'm confused and don't know what to do. (answered by AnlytcPhil,Theo)

Working on this problem and don't know how to approach it - Use the given conditions... (answered by jim_thompson5910)

if f(x)=x^2+9 for x>0 A) Find the inverse showing work B) What is the range of f? (answered by swincher4391)

In consider the function 1/x Find the slope of the line L tangent to the graph of... (answered by rothauserc)

I kind of understand how to do these f◦g and g◦f problems, but I dont know... (answered by stanbon)

HELP PLEASE! I for some reason can not understand how to figure out this problem. It (answered by Alan3354)

Can someone please help me. f(x)=x/x�+1 and solve for f(x+2) I know its x+2 on top... (answered by Boreal)

If f(-4)=5, which of the following could not be the inverse of f(x)? a)g(x)=x-9... (answered by ikleyn,Edwin McCravy)

Not sure how to do this problem f (x)=x^2-2 if... (answered by jim_thompson5910)