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thisisarri Group Title

Solve x2 − 3x = 28. HELP ME (:

  • one year ago
  • one year ago

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  1. modphysnoob Group Title
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    x^2 -3x=28 x^2-3x-28=0 factor (x )(x )=0 think of two number that add up to -3 and multiply to -28

    • one year ago
  2. modphysnoob Group Title
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    what two number multiples to be 28?

    • one year ago
  3. thisisarri Group Title
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    ok, one second. @modphysnoob

    • one year ago
  4. thisisarri Group Title
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    -7, and 4

    • one year ago
  5. thisisarri Group Title
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    @modphysnoob

    • one year ago
  6. nader1 Group Title
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    (x-7)(x+4)=0

    • one year ago
  7. nader1 Group Title
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    good job

    • one year ago
  8. modphysnoob Group Title
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    yep, -7+4=-3 -7*4=-28

    • one year ago
  9. thisisarri Group Title
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    haha thanks @nader1

    • one year ago
  10. modphysnoob Group Title
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    so you'd get here (x-7)(x+4)=0 from here , we can deduce that x=7,-4

    • one year ago
  11. thisisarri Group Title
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    thanks doe

    • one year ago
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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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