You already know about Newton's method. Now meet Dewton's method: It is almost identical to Newton's method. The only difference is instead of using the root of the tangent line, it always takes the root of the line with slope 3 at the same tangent point. Apply one iteration of Dewton's method to the following function to calculate the asked for quantity.f(x)=x3x-1,x0=-1,x2=?