Casio wins lawsuit against Chinese calculator copy
|
06-27-2021, 07:35 PM
Post: #4
|
|||
|
|||
RE: Casio wins lawsuit against Chinese calculator copy
(06-27-2021 06:34 PM)celltx Wrote: In the end of the video, it shows that the fake calculator returns completely incorrect answer. To be fair to the fake calculator, equation setup (Newton's method) have 2 solutions. f(x) = (21+x)/x - 8 f'(x) = -21/x^2 nt(x) = x - f(x)/f'(x) = x - ((21+x)/x - 8) / (-21/x^2) = x - x*(x-3)/3 nt(x) = x → x = 0 or 3 We should setup equation by scaling away denominator f(x) = (21+x) - 8x f'(x) = -7 nt(x) = x - f(x)/f'(x) = x - (21-7x)/(-7) = 3 → x = 3 --- Tips: it is safer to put equation on the stack (without "=" key), before SOLVE This way, we can recover equation with ↑ key 0 STO X // guess in X, such that equation does not ERROR 21+X-8X = // equation now on stack SOLVE SOLVE → X = 3 |
|||
« Next Oldest | Next Newest »
|
Messages In This Thread |
Casio wins lawsuit against Chinese calculator copy - celltx - 06-22-2021, 08:05 PM
RE: Casio wins lawsuit against Chinese calculator copy - EdS2 - 06-23-2021, 08:35 AM
RE: Casio wins lawsuit against Chinese calculator copy - celltx - 06-27-2021, 06:34 PM
RE: Casio wins lawsuit against Chinese calculator copy - Albert Chan - 06-27-2021 07:35 PM
RE: Casio wins lawsuit against Chinese calculator copy - EdS2 - 06-28-2021, 06:23 AM
RE: Casio wins lawsuit against Chinese calculator copy - Jlouis - 09-06-2021, 02:28 PM
RE: Casio wins lawsuit against Chinese calculator copy - toml_12953 - 09-06-2021, 02:33 PM
RE: Casio wins lawsuit against Chinese calculator copy - Ren - 09-07-2021, 02:05 PM
|
User(s) browsing this thread: 1 Guest(s)