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jazzyfa30

  • 2 years ago

factoring: x2 - 3x - 28 = 0

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  1. jazzyfa30
    • 2 years ago
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    @Kidkush24 help

  2. hartnn
    • 2 years ago
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    can you find 2 numbers whose sum is -3 and product is -28 ?

  3. jazzyfa30
    • 2 years ago
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    7 and 4

  4. hartnn
    • 2 years ago
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    one of them is negative, which ?

  5. jazzyfa30
    • 2 years ago
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    -7 and 4

  6. hartnn
    • 2 years ago
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    correct! so, split up -3x as -7x+4x x^2 -7x+4x-28 now factor out x from first 2 terms and 4 from last two, can you ?

  7. jazzyfa30
    • 2 years ago
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    ummmm idthink so

  8. hartnn
    • 2 years ago
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    ok, to factor out x from x^2-7x, we get x (x-7) and 4 from 4x-28. we get +4(x-7) so, x(x-7)+4(x-7) factor out (x-7) from this!

  9. jazzyfa30
    • 2 years ago
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    -7 4(x-7)??????

  10. hartnn
    • 2 years ago
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    if you take (x-7) out from those 2 terms, what remains is (x-7) (x+4) thats it! factored.....

  11. hartnn
    • 2 years ago
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    and don't forget the = 0 (x-7)(x+4) = 0 do you need to solve it too ? or just factoring ?

  12. jazzyfa30
    • 2 years ago
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    just factor can u help me with a few more

  13. hartnn
    • 2 years ago
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    did you get this one properly ?

  14. jazzyfa30
    • 2 years ago
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    yes

  15. hartnn
    • 2 years ago
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    yeah, then i can help u with next problems...just post them in a new post...so that if i am busy, others can help you too!

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