It is given that the expression ax^(2)+b...

It is given that the expression `ax^(2)+bx+c` is positive for all x greater than 5 .Then which of the following is true.
(1) the equation `ax^(2)+bx+c=0` has equal roots
(2) `a>0 and b<0`
(3) `a>0` but `b` may or may not be negative
(4) `c>5`

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