SICP exercise 1.40
From Drewiki
Problem
Define a procedure cubic that can be used together with the newtons-method procedure from the text in expressions of the form (newtons-method (cubic a b c) 1) to approximate zeros of the cubic x3 + ax2 + bx + c.
Solution
Here's cubic:
And here's newtons-method and friends from the text:
Tests performed using Chicken Scheme 3.1 on a MacBook Pro running Mac OS X 10.5.
Output:
-0.99999999999978
Output:
2.65319902917972e-05
Output:
1.0
Output:
-1.99999999998065

