anonymous
  • anonymous
Factor 3x2 − 12x − 36 completely.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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marihelenh
  • marihelenh
First you can take out a 3 and get\[3(x^2-4x-12)\]
anonymous
  • anonymous
3(x − 6)(x + 2) (3x + 6)(x − 2) 3(x + 4)(x − 3) (3x − 4)(x + 3)
anonymous
  • anonymous
those are answer choices

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marihelenh
  • marihelenh
You know it has to be either A or C because the 3 is factored out.
anonymous
  • anonymous
C
marihelenh
  • marihelenh
No, it would be A. Multiply it out to check it.
radar
  • radar
One obvious factor is 3 getting x2 -4x-12 or 3(x2 - 4x - 12) now factor further the x2 -4x -12.
anonymous
  • anonymous
ok
anonymous
  • anonymous
So i got (3x+6)(x-6)
radar
  • radar
Factor the (3x+6) "factor completely" means every factor must be prime.
anonymous
  • anonymous
oh! So it would be A!
anonymous
  • anonymous
Can you help with one more?
radar
  • radar
A was a good choice, better than rest.
anonymous
  • anonymous
Which expression is a factor of 3ab − 6a + 4b − 8?
anonymous
  • anonymous
4b − 2 3a + 4 3b − 4b 3ab − 2
anonymous
  • anonymous
i got a
anonymous
  • anonymous
Its A.
radar
  • radar
3ab-6a+4b-8 3a(b-2) +4(b-2) (b-2)(3a+4) are the factors
radar
  • radar
I personally don't like A. Hopefully you can see why I prefer B.

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