Please help me work this function

[typingken]

Given that f(x)=x^2-7 x and g(x)=x + 4, find


(a) f+g=
(b) f-g=
(c) fg=
(d) f/g=

Could someone please help me work out like two of these problems so I can get some direction on how to solve this type of problem?

 

[stapel]

The notation means exactly what it looks like it should mean:

. . . . .(f + g)(x) = f(x) + g(x)

. . . . .(f - g)(x) = f(x) - g(x)

. . . . .(fg)(x) = [f(x)][g(x)]

. . . . .(f/g)(x) = [f(x)]÷[g(x)]

So plug the given function rules into the formulas (above), and simplify. That's all there is to this. (In other words, this looks way worse than it really is.)

Eliz.

 

[typingken]

Hi eliz.
So I figured
a=x^2-3+x
b=x^2-7-x
c=x^2+x-28
d=x^2/x - 1.75 ????

Not sure why but all of those were incorrect. Can you fill me in were I am going wrong?

 

[typingken]

i am missing an x in all of my work done. Let me re-work these ones out. Sorry

 

[stapel]

Not sure why but all of those were incorrect. Can you fill me in were I am going wrong?

Until we can see your work (what you did), I'm afraid it will be difficult to figure out where you went wrong.

Eliz.

 

[typingken]

ok for A I did
x^2-7x+x+4
simplified...
A=x^2-6x+4 (Correct!)


For B
x^2-7x-x+4
simplify
b=x^2-8x+4 (Incorrect!)

What are your thoughts on this? (besides im a moron )

 

[typingken]

Can anyone reply on why my anwser for B is wrong?

 

[Unco]

You forgot parentheses ().

 

[typingken]

Where are the () suppose to go?????

 

[Unco]

f - g = (x^2 - 7x) - (x + 4)

The x and the 4 are both subtracted.