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Student Support Forum: 'Stupid problem with solve' topicStudent Support Forum > General > Archives > "Stupid problem with solve"

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Michael
02/22/05 05:48am

Hello,

I've got a very stupid problem with the Solve function:

I'm trying to extract the parameter F from the following expression:
\!\(\*
RowBox[{
StyleBox[
RowBox[{
StyleBox["d",
FontFamily->"Symbol"],
StyleBox["b",
FontFamily->"Courier New
"]}]], "=", \(\((\((1.3333333333333333`*^-14\ F\ \((
2.1715831307718796`*^-6 +
T)\)\ \((\(\(0.000054999102015670725`\)\(\[InvisibleSpace]\)\) +
T)\)\ \((2.7018841608770822`*^-8 + \((\(-0.00009467847152918785`\
\) + T)\)\ T)\)\ \((3.025049389944464`*^-9 + T\ \
\((\(\(0.00011000089798432814`\)\(\[InvisibleSpace]\)\) + T)\))\)\ \
\((1.4177997261049472`*^-8 + T\ \((\(\(0.00022313188839841693`\)\(\
\[InvisibleSpace]\)\) + T)\))\))\)/\((\((\(\(0.000055`\)\(\[InvisibleSpace]\)\
\) + 1.`\ T)\)\^3\ \((5.4165196301728004`*^-8 + T\ \
\((\(\(0.00006000896985039874`\)\(\[InvisibleSpace]\)\) + T)\))\)\^2)\) - \
\(1.5675000000000003`*^-14\
T\ \((\(\(0.00001545579367477958`\)\(\[InvisibleSpace]\)\) +
T)\)\ \((\(\(0.00014453523647482168`\)\(\
\[InvisibleSpace]\)\) + T)\)\ \((\(\(0.0002`\)\(\[InvisibleSpace]\)\) +
T)\)\ V\)\/\(5.416519630172801`*^-8 + T\ \
\((\(\(0.0000600089698503988`\)\(\[InvisibleSpace]\)\) + \
T)\)\))\)/\((\((\(\(0.000015455793674779585`\)\(\[InvisibleSpace]\)\) + \
T)\)\^2\ \((\(\(0.00014453523647482166`\)\(\[InvisibleSpace]\)\) + T)\)\^2)\)\
\)}]\)

Ok I don't know if it is very clear but the expression is of the type db=a(T,V)*F+b(T,V) so it should not be a problem to express F in function of a,d and b.
But when I use the command "Solve[db == Z, F]" I got an empty list as a result!!!
(Z has no value)


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