Help on solving equation?

Hello,

I need urgent help for the small code belwo to solave the equation I jave tried but I always seeing this error ((Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters)).

Code is belwo:

A1=1.825*10^6;
Zi=67;
M=123;
B=50.29;
a=5;
Z=134;
AO0=2.6;
P0=54.6;
C=12;
Ka=2.45;
V=10^((-A1*(Zi^2)*sqrt(M))/(1+B*a*sqrt(M)));
syms A
eqn=AO0-(C*V*(A*(((1-Z*C^0.5)^(-1))+((AO0-P0)/(2*A))/(1+((AO0-P0)/(2*AO0))-(AO0/2)))*(Ka/AO0)-(A*(((1-Z*C^0.5)^(-1))+((AO0-P0)/(2*A))/(1+((AO0-P0)/(2*AO0)));
sola = solve(eqn, A)

[KALYAN ACHARJYA]

My suggestion break the eqn statement in multiple parts, because it is confusing check.

Answer 1

[Stephan]

Hi,

try:

A1=1.825*10^6;
Zi=67;
M=123;
B=50.29;
a=5;
Z=134;
AO0=2.6;
P0=54.6;
C=12;
Ka=2.45;
V=10^((-A1*(Zi^2)*sqrt(M))/(1+B*a*sqrt(M)));
syms A
eqn=AO0-C*V*A*(((1-Z*C^0.5)^(-1))+((AO0-P0)/(2*A))/(1+((AO0-P0)/(2*AO0))-(AO0/2)))*(Ka/AO0)-(A*(((1-Z*C^0.5)^(-1))+((AO0-P0)/(2*A))/(1+((AO0-P0)/(2*AO0)))));
sola = double(solve(eqn, A))

result is:

sola =

  133.8103

Does this appear to be a correct result? If not check the parenthesis of your equation.

Best regards

Stephan