I have send this in AFX/CFX/FX room but I do not have a anwer truely. Please help me...
When I solve the equation
'solve(X^3-(A+B+C)*X^2+(AB+BC+BA)*X-ABC=0,X)'
( or 'solve(expand((X-A)(X-B)(X-C)),X'),
I got
'X=0 :profanity:
X=C
X=A'.
Why?
What Problem To May Calc.?
Started by
vanhoa
, Mar 29 2006 08:17 AM
4 replies to this topic
#1
vanhoa
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Posted 29 March 2006 - 08:17 AM
#2
Andy.Davies
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Posted 29 March 2006 - 10:39 PM
Moved due to wrong forum
#3
genesis
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Posted 31 March 2006 - 02:57 AM
In the first case, the "=0" should be omitted. This is the syntax for the Solve function:
Solve( f(x) , n , a , B )
where n = initial estimated value, a = lower limit, and b = upper limit
In f(x), only x can be used as a variable, with other variables becoming constants (which you have done correctly). Thus, n is not the variable you wish to solve for, but rather the initial estimated value, commonly 0 or a user defined variable (so I can't tell if you did this correctly). Lastly, the lower and upper limit can be omitted (as you have done, which is most common), and the Solve function is prone to errors.
Solve( f(x) , n , a , B )
where n = initial estimated value, a = lower limit, and b = upper limit
In f(x), only x can be used as a variable, with other variables becoming constants (which you have done correctly). Thus, n is not the variable you wish to solve for, but rather the initial estimated value, commonly 0 or a user defined variable (so I can't tell if you did this correctly). Lastly, the lower and upper limit can be omitted (as you have done, which is most common), and the Solve function is prone to errors.
#4
Lovecasio
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Posted 31 March 2006 - 03:36 AM
Hi.
Nice to meet you. It seems to me that you are Vienamese, right?
genesis, here vanhoa doesn't say about the solve() function in "Run.Mat" but in CAS. I got the same result as vanhoa. Well it may be a bug in CAS of AFX2.0+. I also try on my CP300 and it did well.
Nice to meet you. It seems to me that you are Vienamese, right?
genesis, here vanhoa doesn't say about the solve() function in "Run.Mat" but in CAS. I got the same result as vanhoa. Well it may be a bug in CAS of AFX2.0+. I also try on my CP300 and it did well.
#5
Guest_Guest_vanhoa_*_*
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Posted 01 April 2006 - 06:55 AM
HiHi.
Nice to meet you. It seems to me that you are Vienamese, right?
genesis, here vanhoa doesn't say about the solve() function in "Run.Mat" but in CAS. I got the same result as vanhoa. Well it may be a bug in CAS of AFX2.0+. I also try on my CP300 and it did well.
That is right. I am Vietnamese.
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