i have confused in one topic and please help me,suppose that we have following function $f(x)=x^3+x^2-2*x-3)$ we know that there is a tangent of this function which goes through point $(1,-3)$,we are required to find abscissa,where this tangent intersect ox axis. what i have tried first it to find derivative,so we have ($f(x)'=3*x^2+2*x-2)$,now what does mean abscissa of intersection of tangent line with ox axis?if it means that,it includes every point where y=0,then answer is this
http://www.wolframalpha.com/input/?i=3*x%5E2%2B2*x-2%3D0
but if it is y value at $x=0$,then answer is $-2$,so i am confused about this and please help me,also what i should do if instead of ox axis,,we are required to find ordinate of intersection of tangent line with oy axis?