36k^2-104k-68=0 split the middle term
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may be your question is.....
36k^2-104k+68=0
4(9k^2-26k+17)=0
9k^2-26k+17=0
9k^2-17k-9k+17=0
k(9k-17) -1(9k-17)=0
k= 17/9 and k= 1
hope it helps you
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