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anonymous

  • one year ago

Can anyone help me? Solve x2 + 9x + 20 = 0. (4 points) x = 2, x = 10 x = -2, x = -10 x = -5, x = -4 x = 5, x = 4

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  1. anonymous
    • one year ago
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    9x=5x+4x

  2. anonymous
    • one year ago
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    make factors

  3. anonymous
    • one year ago
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    factors?

  4. Bee_see
    • one year ago
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    think like this. what two numbers add up to 9 and equal 20 if you multiply them?

  5. Bee_see
    • one year ago
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    5 and ???

  6. anonymous
    • one year ago
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    oh sorry

  7. Bee_see
    • one year ago
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    |dw:1438216512930:dw|

  8. Bee_see
    • one year ago
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    5 + n= 9 and 5 times n = 20. what's n in this case?

  9. Bee_see
    • one year ago
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    are you having trouble finding n? if so, then do this: 9-5=?? and 20/5=???

  10. anonymous
    • one year ago
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    n, its 4

  11. Bee_see
    • one year ago
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    right! so it fits in both conditions!

  12. anonymous
    • one year ago
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    yes

  13. Bee_see
    • one year ago
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    |dw:1438216838079:dw|

  14. Bee_see
    • one year ago
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    what's x on the left side? what's x on the right side?

  15. anonymous
    • one year ago
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    -5 and -4

  16. Bee_see
    • one year ago
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    righ! that's the answer!

  17. Bee_see
    • one year ago
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    do you get it? If you only have x^2 at the beginning of your equation that you can just do this: (X___)(X____)

  18. anonymous
    • one year ago
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    yeah thanks!

  19. Bee_see
    • one year ago
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    |dw:1438217003935:dw|

  20. Bee_see
    • one year ago
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    to check, you can distribute: |dw:1438217220264:dw|

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