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thisisarri

  • 2 years ago

Solve x2 − 3x = 28. HELP ME (:

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  1. modphysnoob
    • 2 years ago
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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

  2. modphysnoob
    • 2 years ago
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    what two number multiples to be 28?

  3. thisisarri
    • 2 years ago
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    ok, one second. @modphysnoob

  4. thisisarri
    • 2 years ago
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    -7, and 4

  5. thisisarri
    • 2 years ago
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    @modphysnoob

  6. nader1
    • 2 years ago
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    (x-7)(x+4)=0

  7. nader1
    • 2 years ago
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    good job

  8. modphysnoob
    • 2 years ago
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    yep, -7+4=-3 -7*4=-28

  9. thisisarri
    • 2 years ago
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    haha thanks @nader1

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

  11. thisisarri
    • 2 years ago
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    thanks doe

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