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Integrals in solve app?
10-22-2014, 03:27 AM (This post was last modified: 10-22-2014 07:51 PM by Han.)
Post: #6
RE: Integrals in solve app?
In regular math type, you are asking the solver to solve:

\[ \int_0^B (8A-27A^3)\ dA = 0.3 \]

or equivalently

\[ 4B^2-\frac{27}{4}B^4 = 0.3 \]

… but you're asking the calculator to solve for A.

Quote:I'm getting bad guess messages...tried integral symbol, and also int(8*A-27*A^3,A,0,B)=3
Used guesses for B of .3 and solved for A in the solve app.

A is not even a variable in this equation. It appears in the integral, but it is a dummy variable, no? I do think there may be a bug of sorts since A is not truly a variable. So you should really only be allowed to solve for B. When A is set to its default value (of zero), you will generate an error because the calculator thinks you're integrating with respect to the "variable" 0 -- which of course makes no sense.

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Messages In This Thread
Integrals in solve app? - lrdheat - 10-21-2014, 07:22 PM
RE: Integrals in solve app? - Helge Gabert - 10-21-2014, 09:49 PM
RE: Integrals in solve app? - lrdheat - 10-22-2014, 01:54 AM
RE: Integrals in solve app? - lrdheat - 10-22-2014, 01:56 AM
RE: Integrals in solve app? - lrdheat - 10-22-2014, 02:25 AM
RE: Integrals in solve app? - Han - 10-22-2014 03:27 AM
RE: Integrals in solve app? - DrD - 10-22-2014, 05:27 PM
RE: Integrals in solve app? - Han - 10-23-2014, 02:39 PM
RE: Integrals in solve app? - Tim Wessman - 10-22-2014, 04:29 PM
RE: Integrals in solve app? - lrdheat - 10-22-2014, 07:38 PM
RE: Integrals in solve app? - Helge Gabert - 10-23-2014, 01:57 AM
RE: Integrals in solve app? - DrD - 10-23-2014, 04:10 PM



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