anonymous
  • anonymous
Check my work? Given f(x) = x2 + 6x and g(x) = 3x2 + 12x, find (g – f)(x). My answer:2x^2+18 Given f(x) = 7x – √2 and g(x) = x + √2, find (f + g)(x). My answer:7 – √2x Which of these is the composite function f(g(x))? f(x) = x2 – 5 g(x) = 9x – 2 My answer:f(g(x)) = 81x2 – 36x – 1 Given f(x) = x2 – 4x – 2 and g(x) = 2x2 + 4x + 9, find (f – g)(x). My Answer:-3x2 – 8x – 11 Given f(x) = 3x + 3 and g(x) = x2 + 11x – 7, find (gf)(x). My Answer: 36x3 – 3x2 + 12x – 21
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
dan815
  • dan815
|dw:1371010866175:dw|
dan815
  • dan815
|dw:1371010928625:dw|
anonymous
  • anonymous
Okay can you explain the right answers for me then?

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More answers

dan815
  • dan815
|dw:1371011119759:dw|
dan815
  • dan815
|dw:1371011141117:dw|
dan815
  • dan815
|dw:1371011206079:dw|
dan815
  • dan815
do these 2 right first
anonymous
  • anonymous
Do I use foil on them?
dan815
  • dan815
ur not multiplying them.. there is addition and subtraction between them
dan815
  • dan815
|dw:1371011309791:dw|
dan815
  • dan815
can u see how i got that?
anonymous
  • anonymous
yes, but honestly, that's what I was doing.
dan815
  • dan815
u didnt subtract properly
dan815
  • dan815
12x-6x=?
dan815
  • dan815
12 apples - 6 apples = ?
anonymous
  • anonymous
6
dan815
  • dan815
6 of what ...
dan815
  • dan815
6 is just a number it doesnt say anything
anonymous
  • anonymous
6x
dan815
  • dan815
6 apples
anonymous
  • anonymous
oh, answered the wrong question
dan815
  • dan815
ok so fix ur answer
dan815
  • dan815
whats ur final answer?
anonymous
  • anonymous
6 apples
dan815
  • dan815
no i mean ur answer to question 1
anonymous
  • anonymous
OH. omg, sorry
anonymous
  • anonymous
6x^2?
dan815
  • dan815
wuutt
dan815
  • dan815
okay forget xs for now
dan815
  • dan815
think of x^2 as bananas and x as apples
dan815
  • dan815
|dw:1371011700533:dw|
anonymous
  • anonymous
20?
dan815
  • dan815
T_T
Luigi0210
  • Luigi0210
D:
dan815
  • dan815
how many apples and bananas are left?
dan815
  • dan815
if you have 3 bananas and 12 apples and i take 1 banana and 6 apples from you, what do you have left?
anonymous
  • anonymous
Oh, okay 2 bananas and 6 apples
dan815
  • dan815
okya so remember bananas are x^2 and apples are x so u have 2 x^2 and 6x remaining or 2x^2+6x
dan815
  • dan815
|dw:1371011906764:dw|
anonymous
  • anonymous
/).(\ Sorry for being dumb
dan815
  • dan815
ur not dumb... u just need to understand this whole algebra thing
dan815
  • dan815
x and y just mean this unknown quantitty we are working with, and we are trying to represent them in some other way
dan815
  • dan815
you've been working with them all this time, but u didnt know it
anonymous
  • anonymous
Well, I know that. The bananas and apples are too much yo. I thought you wanted them combined altogether.
dan815
  • dan815
think about this... like you know 1+2 = 3 but this actually means 1 unit + 2 units = 3 units u just never bothered to put that units in lol
dan815
  • dan815
what is this 2 pants + 3 skirts -1 skirt + 5 jeans = ?
anonymous
  • anonymous
2 skirts and 2 pants and 5 jeans
dan815
  • dan815
very good.. ur algebra training is complete
dan815
  • dan815
now do question 2
anonymous
  • anonymous
lol thanks
anonymous
  • anonymous
i get 7x-2
anonymous
  • anonymous
NO WAIT. It's just 8x
dan815
  • dan815
err not quite
dan815
  • dan815
oh yes u are right just 8x
dan815
  • dan815
ok move on
anonymous
  • anonymous
Um, I'm stuck on this one. The fourth one?
dan815
  • dan815
ya
dan815
  • dan815
write it out first what is f-g?
anonymous
  • anonymous
yes (2x^2 + 4x + 9)-(x^2 – 4x – 2)
anonymous
  • anonymous
oh whoops its the other way (x^2 – 4x – 2)-(2x^2 + 4x + 9)
anonymous
  • anonymous
@dan815

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