Consider the functions f(x) = x2 − 13 and g(x) = x + 5. What is the value of f[g(−4)]?

- anonymous

Consider the functions f(x) = x2 − 13 and g(x) = x + 5. What is the value of f[g(−4)]?

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- katieb

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- lalaland_lauren

is that x squared minus 13?

- anonymous

Yeeesss ma'am

- lalaland_lauren

okay so here's how it goes

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## More answers

- lalaland_lauren

\[x^2 - 13 \]
\[(x+5)^2 - 13\]
\[x^2 + 20x + 25 - 13\]
what are the answer choices?

- anonymous

−12
3
−13
8
How did you get 20x ?

- lalaland_lauren

because of (x+5)(x+5) since it's squared

- anonymous

Okay , that makes sense

- lalaland_lauren

|dw:1437447950067:dw|

- anonymous

So you're using the FOIL method right ?

- lalaland_lauren

FOIL? What's that?

- anonymous

Sorry , I was thinking of something else . Its another way to figure out polynomials and trinomials and such .

- lalaland_lauren

Crap crap crap I did the whole thing wrong, disregard what I said!

- lalaland_lauren

I'm redoing the whole problem, give me a minute

- anonymous

Hahahaha alrighty

- lalaland_lauren

This might take a while lol xD

- anonymous

Hahahaha its all good ! xp

- anonymous

Consider the functions f(x) = 3x − 2 and g(x) = x2 − 1. What is the value of (f − g)(−2)?
Okay, x=(-2)
f(-2) =3*(-2) - 2
f(-2) = -6 -2
f(-2) = -8
g(-2) = (-2)^2 − 1
g(-2) = 4 -1
g(-2) = 3
(f-g) = -8 - 3
I think you can figure it out from there.

- anonymous

(f − g)(−2) is f[g(−4)] though

- lalaland_lauren

\[f(x)=x^2-13\]
\[g(x)=x+5\]
and you're trying to find f[g(-4)], so since it shows that g(x) = -4, you plug it in, after you plug in the f(g) however, SOOOO
\[(x-5)-13\]
\[(-4+5) - 13\]
got it?

- anonymous

https://answers.yahoo.com/question/index;_ylt=AwrBT7z9uK1VbFkAtv5XNyoA;_ylu=X3oDMTEzZTFrcTl2BGNvbG8DYmYxBHBvcwMxBHZ0aWQDVklQNjEzXzEEc2VjA3Ny?qid=20101222165834AAfxF4P&p=Consider%20the%20functions%20f%28x%29%20%3D%20x2%20%E2%88%92%2013%20and%20g%28x%29%20%3D%20x%20%2B%205.%20What%20is%20the%20value%20of%20f[g%28%E2%88%924%29]%3F

- lalaland_lauren

@Skielerlucas04 you're doing it all wrong...

- anonymous

So , Im guessing my answer is -12 ?

- lalaland_lauren

yup :)

- lalaland_lauren

Do you understand it now?

- anonymous

sorry, i tried to help

- lalaland_lauren

It's fine

- anonymous

Thank you so much ! These trinomials drive me crazy ! I understand it 10x more

- lalaland_lauren

They drive me crazy too xD are you taking FLVS? because I literally just finished this a few hours ago

- anonymous

i am:D

- anonymous

I am actually ! Im taking my EOC tomorrow and all my exams I am finally finishing Monday , what a summer break

- anonymous

"break"

- anonymous

lol i feel ya!!!!!!

- lalaland_lauren

What teacher do you have? We might have the same one lol

- anonymous

Ya know ! It sucks , but Im happy to get it all finished with && I have Ms. Johnson

- lalaland_lauren

I have to finish Algebra 1 Segment 2 and all segments of World History before summer ends *sigh*
Aww I have Ms. McManus :(

- anonymous

That sucks ! I still have my English 1 to finish including my essay and stuff , Algebra 1 is the worst , Im terrible at math -__- If you ever need help on World History I got ya ! I just finished that !

- lalaland_lauren

I've got the collaboration for segment two of english one so I'm basically done lol, and thanks! by any chance do you have 1.02 for world history? I gotta do that xD

- anonymous

I got a 96% on it , so I hope it helps !(:

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- lalaland_lauren

You're my savior!!!!!! :D

- lalaland_lauren

By the way, you can alwaays ask me for help on any of the assessments for algebra, I'm getting A's all over the place lol :)

- lalaland_lauren

I can give you the answers to them and stuffsssssss

- anonymous

I got chu !(:&& 'heck' yeah lol ! Im on 9.02 right now , Im just now getting used to this module , 8.07 confused me so much though , but I skipped it , Im trying to see if Ill get away with it xp

- lalaland_lauren

Well, I haven't done my welcome call yet and I've skipped all the DBA's and tests and I'm already 1/3 through lol! The only assignment I skipped though is 6.06 I think, since I need like 12 people for the scatter plot thing and I'm too shy and socially awkward to ask people if I can measure them lmao

- anonymous

Hahahahah trust me I feel you on that ! It is kind of an awkward subject to go up to people and ask , hey can I measure your arm length ?

- lalaland_lauren

"And your height too, I promise you this isn't for creepy reasons." XD

- anonymous

Hahahahah exactly "just my algebraa teacher wants to know" xD

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