#| BEGIN (Write your solution here) |#
(define (square x) (* x x))
(define (cube-root-iter guess x)
  (if (good-enough? guess x)
      guess
      (cube-root-iter (improve guess x) x)))
(define (improve guess x)
  (/ (+ (/ x (square guess)) (* 2 guess)) 3))
 (define (good-enough? guess x) 
   (= (improve guess x) guess)) 
(define (cube-root x)
  (cube-root-iter 1.0 x))
(cube-root 8)
#| END |#