#| BEGIN (Write your solution here) |#
(define precision 0.0001)

(define (square x)
	(* x x)
)
(define (cube x)
	(* x x x)
)

(define (good-enough? guess x)
  ( < (/ (abs (- (cube guess) x)) guess) precision)
)

(define (improve guess x)
  (/ (+ (/ x (square guess)) (* 2 guess)) 3)
)

(define (cube-iter guess x)
	(if
  	(good-enough? guess x)
		guess
    (cube-iter (improve guess x) x)
  )
)

(define (cube-root x)
  (cube-iter 2.0 x)
)

#| END |#