No calculus (Posted on 2002-07-31)

	Submitted by Cheradenine
Rating: 3.2000 (10 votes)
Solution:	(Hide)
Define a tangent y = Ax + B of y = x^2. we have x^2 = Ax + B, x^2 - Ax - B = 0, because Ax + B is a tangent, there is only one root to this quadratic equation, so in the quadratic formula b^2 - 4ac = 0. which in the formula leads to x =-b/2a =-(-A)/2*1 x = A/2 A = 2x. since in y = Ax + B, A is the gradient, then d/dx(x^2) = 2x

	Subject	Author	Date
	Puzzle Solution	K Sengupta	2024-01-29 07:18:39
	re: OMG :'(	Ravi Raja	2003-02-26 04:55:56
	OMG :'(	Irina	2003-02-25 12:22:07
	re: Standard solution	Cheradenine	2002-08-04 22:04:55
	Standard solution	friedlinguini	2002-08-04 13:15:17
	re(6): Hmmmm	Cheradenine	2002-08-02 05:09:55
	re(5): Hmmmm	friedlinguini	2002-08-02 04:50:44
	re(4): Hmmmm	Cheradenine	2002-08-01 22:09:34
	re(3): Hmmmm	TomM	2002-08-01 08:22:01
	re(2): Hmmmm	friedlinguini	2002-08-01 06:50:08
	re(2): Hmmmm	Cheradenine	2002-08-01 06:22:21
	re: Hmmmm	TomM	2002-08-01 05:53:22
	re: hint(2)	TomM	2002-08-01 05:41:19
	re(2): Dumb question	levik	2002-08-01 05:28:24
	re(5): Err....	Nick Reed	2002-08-01 05:04:05
	re: Dumb question	Cheradenine	2002-08-01 04:38:04
	Dumb question	levik	2002-08-01 04:17:03
	hint(2)	Cheradenine	2002-08-01 03:44:21
	re(4): Err....	friedlinguini	2002-08-01 03:14:42
	Hmmmm	Nick Reed	2002-07-31 22:38:33
	Hint	Cheradenine	2002-07-31 22:21:18
	re(3): Err....	Cheradenine	2002-07-31 22:19:13
	re(2): Err....	friedlinguini	2002-07-31 18:22:11
	re(2): Err....	levik	2002-07-31 03:49:36
	re: Err....	Cheradenine	2002-07-31 02:30:35
	Err....	levik	2002-07-31 01:45:38