(define (square-root x)
        (define (avg a b)
                (/ (+ a b) 2))

        (define (abs a)
                (if (< a 0)
                       (- x)
                       x))
        
        (define (improve-guess guess)
                (avg guess (/ x guess)))

        (define (isgood-guess? guess)
               ( < (abs (- (square guess) x)) .001))

        (define (try guess)
                (if (isgood-guess? guess)
                       guess
                      (try (improve-guess guess))))
	(try 1)
	
)

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

(define (avg a b)
  (/ (+ a b) 2))

(define (improve-guess guess x)
  (avg guess (/ x guess)))

(define (isgood-guess? guess x)
  ( < (abs (- (square guess) x)) .001))

(define (try guess x)
  (if (isgood-guess? guess x)
      guess
      (try (improve-guess guess x) x)))

(define (square-root x)
        (try 1))