anonymous
  • anonymous
Choose the correct simplification of the expression (2x − 6)(3x2 − 3x − 6). 6x3 − 24x2 + 6x + 36 6x3 − 24x2 + 6x − 36 6x3 + 24x2 − 6x + 36 6x3 − 24x2 + 6x + 12 @ash2326
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
(2x − 6)(3x2 − 3x − 6). you sure thts rite?
anonymous
  • anonymous
\[(2x-6)(3x^2-3x-6)\]
ash2326
  • ash2326
@unheard did you try?

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More answers

anonymous
  • anonymous
6x3 + 24x2 − 6x + 36
Luigi0210
  • Luigi0210
no steps?
anonymous
  • anonymous
No, I didn't try, because I forgot the method for this one.
ash2326
  • ash2326
@bzbnme Please explain how you got this,
anonymous
  • anonymous
ok...actual i screwed it up... the first term is the same in all cases....the last term must be positive so rule out the second and fourth answers...so the only difference in the first and third one is the second and third terms... x^2 terms are all negative so the real answer should be 6x3 − 24x2 + 6x + 36... sorry for the earlier error!
anonymous
  • anonymous
or just work it out like this \[2x(3x^2-3x-6)-6(3x^2-3x-6)\]
anonymous
  • anonymous
you have to do two things first.|dw:1370365425708:dw| what do you get? :)
anonymous
  • anonymous
Get it?
ash2326
  • ash2326
@unheard do you understand?
anonymous
  • anonymous
Working it out right now
ash2326
  • ash2326
Take your time
anonymous
  • anonymous
http://www.sketchtoy.com/36452135
ash2326
  • ash2326
very good:) now simplify it further. Please combine the like terms
anonymous
  • anonymous
http://www.sketchtoy.com/36452980 ?
ash2326
  • ash2326
There is a small mistake, \[(2x − 6)(3x^2 − 3x − 6)\] \[2x(3x^2-3x-6)-6(3x^2-3x-6)\] \[6x^3-6x^2-12x- (18x^2-18x-36)\] \[6x^3-6x^2-12x-18x^2+18x+36\]
anonymous
  • anonymous
That confused me a bit.
ash2326
  • ash2326
where ?
anonymous
  • anonymous
What you just put..
ash2326
  • ash2326
Any step in particular ?
anonymous
  • anonymous
All of it...
ash2326
  • ash2326
Ok, I'll explain again
anonymous
  • anonymous
Dumb it down for me, haha
ash2326
  • ash2326
We have \[(2x − 6)(3x^2 − 3x − 6)\] 2x is multiplied to the second bracket and -6 is multiplied to the second bracket \[2x\times (3x^2-3x-6) -6\times(3x^2-3x-6)\] Do you get this part?
anonymous
  • anonymous
Yes. I did that.
ash2326
  • ash2326
Yea, now we do the multiplication \[6x^3-6x^2-12x- 6(3x^2-3x-6)\] Now I'll multiply 6 to the bracketed term and keep minus sign outside \[6x^3-6x^2-12x-(18x^2-18x-36)\] Do you get this?
anonymous
  • anonymous
Yeah, didn't I just do that...
ash2326
  • ash2326
Yes, there was a minus error, when you multiplied -6
anonymous
  • anonymous
Ok, so what did I need to fix? Sorry.. I'm really scatterbrained right now, trying to do two algebra problems at once.
ash2326
  • ash2326
Check this, http://www.sketchtoy.com/36455506
ash2326
  • ash2326
last step, I did the changes
anonymous
  • anonymous
http://www.sketchtoy.com/36455851 ?
ash2326
  • ash2326
check this http://www.sketchtoy.com/36455851
ash2326
  • ash2326
You understood? there was a tiny mistake
anonymous
  • anonymous
Yeah, got it, thanks
ash2326
  • ash2326
Welcome :)

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