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



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ktnguyen1
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2x^213x+15=0
2x^215x+2x+15=0
x(2x15)+(2x+15)=0
(2x+15)(1x)=0
2x+15=0 or 1x=0
x=15/2 or x=1

ktnguyen1
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Im not sure that I answer your question

xRAWRRx3
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oh yes, thanks, I got that but then when I checked the answer, it was wrong.

ktnguyen1
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so is my answer corrcet?

xRAWRRx3
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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.

xRAWRRx3
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doesn't equal out.

ktnguyen1
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oh I saw the problem

xRAWRRx3
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what is it?

ktnguyen1
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2x^210x3x+15=0
2x(x5)3(x5)=0
(2x3)(x5)=0
x=3/2 or x=5

xRAWRRx3
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why did you separate them like that though?

ktnguyen1
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the corrct answer after put #in to check x=5

ktnguyen1
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just easy for me to see

xRAWRRx3
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okay, thank you :)

ktnguyen1
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you are welcome