Firejay5
  • Firejay5
Simplify. Use long division to solve. Subtract your answers, NOT add 10. (x^3 + 13x^2 - 12x - 8) / (x + 2)
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!
Firejay5
  • Firejay5
My answer is -72, but I don't know what to do next
Australopithecus
  • Australopithecus
https://www.youtube.com/watch?v=l6_ghhd7kwQ watch this video
.Sam.
  • .Sam.
Setup the long division as follows, solve by dividing . (x^3 + 13x^2 - 12x - 8) with (x + 2)
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Australopithecus
  • Australopithecus
it teaches you long division of polynomials
Australopithecus
  • Australopithecus
Check alternative forms to see if your answer is correct https://www.wolframalpha.com/input/?i=%28x^3+%2B+13x^2+-+12x+-+8%29+%2F+%28x+%2B+2%29
Australopithecus
  • Australopithecus
what ever remainder you have left you have to keep it divided by x + 2
Firejay5
  • Firejay5
I know how to do it, it's just I don't know if I put it over x + 2 ----> \[\frac{ x + 2 }{ -72 }\]
.Sam.
  • .Sam.
What do you have for your long division?
Australopithecus
  • Australopithecus
x+2 remains in the denominator and it should be 60
Australopithecus
  • Australopithecus
I'm pretty sure based on wolfram alphas answer
Firejay5
  • Firejay5
@.Sam. so far
.Sam.
  • .Sam.
The answer goes with|dw:1351049782957:dw|
Firejay5
  • Firejay5
I know that; it's just I need help with where the -72 goes and @Australopithecus it's not 60
.Sam.
  • .Sam.
@Firejay5 the remainder is 60
Firejay5
  • Firejay5
No it's not it's -72 I did my work
.Sam.
  • .Sam.
Try check your work with this,
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Firejay5
  • Firejay5
It's -76
Firejay5
  • Firejay5
when you subtract; it's like you're distributing - into the second equation http://assets.openstudy.com/updates/attachments/50875f3ae4b058e80cf64652-.sam.-1351050109514-2.png
Firejay5
  • Firejay5
Like when you are subtracting 11x^2 - 12x - (11x^2 + 22x)
Firejay5
  • Firejay5
you are are trying to cancel and get rid of the 11x^2
.Sam.
  • .Sam.
yes, then you get -34 x
Firejay5
  • Firejay5
It should be -34x - 8 - (34x + 68)
.Sam.
  • .Sam.
-34 x 2 = -68
.Sam.
  • .Sam.
its not +68 but its -68
Firejay5
  • Firejay5
what's -8 - 68
.Sam.
  • .Sam.
You should be careful there, its actually -8-(-68)
Firejay5
  • Firejay5
Are you getting confused??? @.Sam.
.Sam.
  • .Sam.
don't memorize the facts, just remember that it is top minus the bottom, you look back the previous steps, all you do is to subtract the top one with the bottom one, the steps that I gave you is computer generated, its completely true.
Firejay5
  • Firejay5
you have to apply the negative -(34x + 68) to all number s in parentheses
Australopithecus
  • Australopithecus
a remainder is just part of the equation that you cannot divide, so it is left with the denominator so in your case 60/(x+2)
.Sam.
  • .Sam.
The actual answer is 60, why are you ignoring it? Take a look at the picture below.
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Australopithecus
  • Australopithecus
I'm basing my 60/(x+2) on the wolfram alpha simplification
Firejay5
  • Firejay5
It's not -34x - 68 it's -(34x + 68) the minus/negative in front of the parentheses goes with everything in it

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