i) y=ax^2 and y= 12x + 3
so by equating y, you will get
ax^2 = 12x + 3 then moving to one side, you will get a quadratic equation in terms of x and a
thus you get, ax^2 - 12x- 3 = 0
ii) Now they tell you that the line is a tangent, therefore it touches the parabola at one point. This means...