Exercise 1.40. Define a procedure cubic that can be used together with the newtons-method procedure in expressions of the form
(newtons-method (cubic a b c) 1)
to approximate zeros of the cubic x3 + ax2 + bx + c.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| (define (cube x) (* x x x)) | |
| (define (square x) (* x x)) | |
| (define (cubic a b c) | |
| (lambda (x) | |
| (+ | |
| (* 1 (cube x)) | |
| (* a (square x)) | |
| (* b x) | |
| c))) |