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xRAWRRx3

  • 2 years ago

Find the sum of the roots of 2x^2 = 13x - 15.

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  1. ktnguyen1
    • 2 years ago
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    2x^2-13x+15=0 2x^2-15x+2x+15=0 -x(2x-15)+(2x+15)=0 (2x+15)(1-x)=0 2x+15=0 or 1-x=0 x=-15/2 or x=1

  2. ktnguyen1
    • 2 years ago
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    Im not sure that I answer your question

  3. xRAWRRx3
    • 2 years ago
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    oh yes, thanks, I got that but then when I checked the answer, it was wrong.

  4. ktnguyen1
    • 2 years ago
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    so is my answer corrcet?

  5. xRAWRRx3
    • 2 years ago
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    well, i got the same answer as you did but when i tried to CHECK the answer, it wasn't right.

  6. xRAWRRx3
    • 2 years ago
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    doesn't equal out.

  7. ktnguyen1
    • 2 years ago
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    oh I saw the problem

  8. xRAWRRx3
    • 2 years ago
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    what is it?

  9. ktnguyen1
    • 2 years ago
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    2x^2-10x-3x+15=0 2x(x-5)-3(x-5)=0 (2x-3)(x-5)=0 x=3/2 or x=5

  10. xRAWRRx3
    • 2 years ago
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    why did you separate them like that though?

  11. ktnguyen1
    • 2 years ago
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    the corrct answer after put #in to check x=5

  12. ktnguyen1
    • 2 years ago
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    just easy for me to see

  13. xRAWRRx3
    • 2 years ago
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    okay, thank you :)

  14. ktnguyen1
    • 2 years ago
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    you are welcome

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