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If the lines L1:2x-3y-6=0,L2: x+y-4=0 a...

If the lines `L_1:2x-3y-6=0,L_2: x+y-4=0` and `L_3: x+2` and `tanA ,tanB` and `tanC` are the roots of the equation `a x^3+b x^2+c x-15=0` then `a=3` (b) `b=-15` `c=28` (d) `a+b+c=15`

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