anonymous
  • anonymous
Find the sum of the roots of 2x^2 = 13x - 15.
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
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
anonymous
  • anonymous
Im not sure that I answer your question
anonymous
  • anonymous
oh yes, thanks, I got that but then when I checked the answer, it was wrong.

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anonymous
  • anonymous
so is my answer corrcet?
anonymous
  • anonymous
well, i got the same answer as you did but when i tried to CHECK the answer, it wasn't right.
anonymous
  • anonymous
doesn't equal out.
anonymous
  • anonymous
oh I saw the problem
anonymous
  • anonymous
what is it?
anonymous
  • anonymous
2x^2-10x-3x+15=0 2x(x-5)-3(x-5)=0 (2x-3)(x-5)=0 x=3/2 or x=5
anonymous
  • anonymous
why did you separate them like that though?
anonymous
  • anonymous
the corrct answer after put #in to check x=5
anonymous
  • anonymous
just easy for me to see
anonymous
  • anonymous
okay, thank you :)
anonymous
  • anonymous
you are welcome

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