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mikaa_toxica13

Find the product: (3x + 4)(3x − 4) 9x^2 + 24x − 16 9x^2 + 16 9x − 16 9x^2 − 16

  • one year ago
  • one year ago

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  1. sjerman1
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    multiply it by foiling

    • one year ago
  2. mikaa_toxica13
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    okay well can u help

    • one year ago
  3. sjerman1
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    |dw:1363713172377:dw|

    • one year ago
  4. sjerman1
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    just foiling out

    • one year ago
  5. sjerman1
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    does this make sense @mikaa_toxica13

    • one year ago
  6. mikaa_toxica13
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    uhm there is no 9x^2 - 12 answer. only a 9x^2 - 16

    • one year ago
  7. sjerman1
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    sorry 4*-4 = -16

    • one year ago
  8. mikaa_toxica13
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    oh okay thank u. can u help with a few others ?

    • one year ago
  9. sjerman1
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    sure no problem

    • one year ago
  10. sjerman1
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    sorry im doing a few things at once, and at work right now so if it takes me a min to respond, dont worry

    • one year ago
  11. mikaa_toxica13
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    Factor Completely: x^2 + 25 (x + 5)(x + 5) (x + 5)(x − 5) (x − 5)(x − 5) Prime

    • one year ago
  12. mikaa_toxica13
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    ok :)

    • one year ago
  13. sjerman1
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    so the easiest way to do this is to multiply out the factors you have there you know that it needs to multiply out to a positive 25

    • one year ago
  14. mikaa_toxica13
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    okay. i think its B.

    • one year ago
  15. sjerman1
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    now also have you go over the list of items that are prime?

    • one year ago
  16. sjerman1
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    because if you multiply 5*-5 you get -25 not +25

    • one year ago
  17. mikaa_toxica13
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    oh

    • one year ago
  18. sjerman1
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    this factor is prime, im not sure if you were looking up or waiting for a responce but this one can not be factored

    • one year ago
  19. sjerman1
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    to justify this you can take the only one that will work, or rather come close, would be (x + 5)(x + 5) or (x − 5)(x − 5) and both of these would give you a middle term either -10x or +10x

    • one year ago
  20. mikaa_toxica13
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    i was trying to look it up :/ i jus cant really get it

    • one year ago
  21. sjerman1
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    for this, i know its going to be annoying for now, it will be a lot easier the more you do this, but multiply out the terms to find out what it comes out to

    • one year ago
  22. sjerman1
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    (x + 5)(x + 5) = x^2+10x+25 (x + 5)(x − 5) = x^2-25 (x − 5)(x − 5) = x^2-10x+25

    • one year ago
  23. sjerman1
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    then you can see, oh none of these match the answer, therefore it's prime.

    • one year ago
  24. mikaa_toxica13
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    oh okay thanks ! Factor Completely: 36x^2 − 25 (6x − 5)(x + 5) (6x + 5)(6x + 5) (6x − 5)(6x − 5) <--- answer (6x + 5)(6x − 5) Factor Completely: 3x^2 − 21 3(x^2 − 7) <---- answer 3(x + 7)(x − 7) 3(x + 7)(x − 3) Prime

    • one year ago
  25. sjerman1
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    welllllll. on the first one, the easy thing to look at tis you need to have a -25 so what multiplies to give you a -25

    • one year ago
  26. mikaa_toxica13
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    nmv, to teh first one, the answer is D

    • one year ago
  27. sjerman1
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    good job!

    • one year ago
  28. sjerman1
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    on the second one, very good job!

    • one year ago
  29. mikaa_toxica13
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    Factor Completely: 2x^2 − 32 Prime<--- answer 2(x^2 − 16) 2(x + 4)(x + 4) 2(x + 4)(x − 4)

    • one year ago
  30. sjerman1
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    this one is not prime.

    • one year ago
  31. mikaa_toxica13
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    Factor Completely: x2 − 36 (x + 6)(x − 6) (x + 6)(x + 6) (x − 6)(x − 6)<---answer Prime

    • one year ago
  32. mikaa_toxica13
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    okay then its gotta be B

    • one year ago
  33. sjerman1
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    Factor Completely: 2x^2 − 32 Prime 2(x^2 − 16) 2(x + 4)(x + 4) 2(x + 4)(x − 4)<--------answer, because 2(x^2-16) -> 2(x+4)(x-4)

    • one year ago
  34. sjerman1
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    Factor Completely: x2 − 36 (x + 6)(x − 6)<---answer (x + 6)(x + 6) (x − 6)(x − 6) Prime

    • one year ago
  35. sjerman1
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    keep in mind that 6*-6 gives you -36

    • one year ago
  36. sjerman1
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    but the easiest way to look at this is x2 − 36, there is no middle term, this means there has to be one factor is that x + something and x - something to make the middle term go away

    • one year ago
  37. sjerman1
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    does this make sense @mikaa_toxica13

    • one year ago
  38. mikaa_toxica13
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    yes. thank u soo much !

    • one year ago
  39. sjerman1
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    good!

    • one year ago
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