5. The bisection method can be generalized to deal with the case f(x1) f(Xr) > 0, by broadening the bracket. That is, we reduce at and/ or increase Xr, and try again. A reasonable choice for broadening the bracket is to double the width of the interval [x1, Xr], that is m + (21 + ar) / 2, att m - w. art m t w, Incorporate bracket broadening into the bisection method. Note that broadening is not guaranteed to find x1 and x such that f(x1) f(Xr)