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anonymous

  • one year ago

Factor 3x2 − 12x − 36 completely.

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  1. marihelenh
    • one year ago
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    First you can take out a 3 and get\[3(x^2-4x-12)\]

  2. anonymous
    • one year ago
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    3(x − 6)(x + 2) (3x + 6)(x − 2) 3(x + 4)(x − 3) (3x − 4)(x + 3)

  3. anonymous
    • one year ago
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    those are answer choices

  4. marihelenh
    • one year ago
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    You know it has to be either A or C because the 3 is factored out.

  5. anonymous
    • one year ago
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    C

  6. marihelenh
    • one year ago
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    No, it would be A. Multiply it out to check it.

  7. radar
    • one year ago
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    One obvious factor is 3 getting x2 -4x-12 or 3(x2 - 4x - 12) now factor further the x2 -4x -12.

  8. anonymous
    • one year ago
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    ok

  9. anonymous
    • one year ago
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    So i got (3x+6)(x-6)

  10. radar
    • one year ago
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    Factor the (3x+6) "factor completely" means every factor must be prime.

  11. anonymous
    • one year ago
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    oh! So it would be A!

  12. anonymous
    • one year ago
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    Can you help with one more?

  13. radar
    • one year ago
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    A was a good choice, better than rest.

  14. anonymous
    • one year ago
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    Which expression is a factor of 3ab − 6a + 4b − 8?

  15. anonymous
    • one year ago
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    4b − 2 3a + 4 3b − 4b 3ab − 2

  16. anonymous
    • one year ago
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    i got a

  17. anonymous
    • one year ago
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    Its A.

  18. radar
    • one year ago
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    3ab-6a+4b-8 3a(b-2) +4(b-2) (b-2)(3a+4) are the factors

  19. radar
    • one year ago
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    I personally don't like A. Hopefully you can see why I prefer B.

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spraguer (Moderator)
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