Find the equation of normal to the curve : `y = x^3 + x^2 - 11x + 15`, where normal is parallel to the line `x - 3y + 1 = 0`

Find the equation of normal to the curve : y =x^3 - 7x^2 - 20x + 1 , where normal is parallel to the line x + 4y + 7 = 0

Find the equation of normal to the curve : y = 5x^2 - 10x + 11 , where normal is parallel to the line x - 2y + 10 = 0

Find the equation of normal to the curve y = x^3 - 7x^2 -20x + 1 where normal is parallel to the line x + 4y + 7 = 0 .

Find the equations of the normal to the curve: y = x^3 + 5x^2 - 10 x + 10 , where the normal is parallel to the line x - 2y + 10 = 0

Find the equation of normal to the curve, y = .x^3 at the point (1,1).

Find the equation of normal to the curve, y = .x^3 at the point (-1.-1).

Find the equation of normal to the curve, y = .x^3 at the point (2,8).