A function $$y=f(x)$$ has a second order derivative $$f''\left( x \right) = 6\left( {x - 1} \right).$$ If its graph passes through the point $$(2, 1)$$ and at that point the tangent to the graph is $$y = 3x - 5$$, then the function is :

If $$2a+3b+6c=0$$, then at least one root of the equation
$$a{x^2} + bx + c = 0$$ lies in the interval

A point on the parabola $${y^2} = 18x$$ at which the ordinate increases at twice the rate of the abscissa is

The real number $$x$$ when added to its inverse gives the minimum sum at $$x$$ equal :