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If the roots of equation ax^2+bx+10=0 ar...

If the roots of equation `ax^2+bx+10=0` are not rel and istinct where `a,bepsilon R, and m and n` are values of a and b respectively for which `5a+b` is minimum then the family of lines `m(4x+2y+3)+n(x-y-10=0` are concurrent at (A) `(1,-1)` (B) `(-1/6,-7/6)` (C) `(1,1)` (D) none of these

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