Use a bisection criterion for a start

Hybrid Method: combine Bisection and Higher Order Method:
- Newton's Method
- Secant Method (Newton's method with secant approx.)


#+BEGIN_SRC c
fa = f(a)
fb = f(b)
if (fa * fb >= 0) return

error = 10 * tol
iter = 0

while (error > tol && iter < maxiter) {
x0 = 0.5 * (a + b)
x1 = x0 - f(x0) / f'(x0)
if (abs(x1 - x0) > 0.5 * (b - a)) {
// do bisection
} else{
// do newton's method
}
}
#+END_SRC