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anonymous

  • 5 years ago

logx+log(3x-13)=1 I got the answer of 10/3 can someone see if that is right??

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  1. anonymous
    • 5 years ago
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    no it is wrong.

  2. anonymous
    • 5 years ago
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    Ok, thank you.

  3. anonymous
    • 5 years ago
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    log(3x2-13x) = 1 3x2-13x = 10

  4. anonymous
    • 5 years ago
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    I see what I did wrong. I put 26 instead of 13..

  5. anonymous
    • 5 years ago
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    Wait.. no I didnt. Then I move the 10 over right?

  6. anonymous
    • 5 years ago
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    giving me: 3x2-13-10=0 right?

  7. anonymous
    • 5 years ago
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    right

  8. anonymous
    • 5 years ago
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    Then I did the quadratic... maybe I did that wrong

  9. anonymous
    • 5 years ago
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    3x2-15x+2x-10

  10. anonymous
    • 5 years ago
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    where did you get the middle? -15x+2x?

  11. anonymous
    • 5 years ago
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    -13x can be represented as -15x +2x.

  12. anonymous
    • 5 years ago
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    why would I want to put that into my equation?

  13. anonymous
    • 5 years ago
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    when I have 3x2-13x-10. Would you do the quadratic then?

  14. anonymous
    • 5 years ago
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    is the answer 5

  15. anonymous
    • 5 years ago
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    it is a method to factor the quadratic equation. 3x2-13x-10 = 0 3x2-15x+2x-10 = 0 3x(x-5)+2(x-5)= 0 ,factor out x-5, (x-5)(3x+2)=0. so, x= 5 and x = -3/2

  16. anonymous
    • 5 years ago
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    got it!!! Thank you. I didnt notice it factored.

  17. anonymous
    • 5 years ago
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    you should always see if a quadratic equation can be factored, it is much easier. If that fails, do the formula to solve

  18. anonymous
    • 5 years ago
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    I usually do, my teacher just never gives us the ones that factor...lol.Thanks

  19. anonymous
    • 5 years ago
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    you are welcome

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