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Results tagged with equation-solving
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user 20056
Questions on the analytic and numerical equation solving functions of Mathematica (Solve, Reduce, NSolve, FindRoot, DSolve, RSolve, etc.).
0
votes
0
answers
69
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Problem with solving an equation [duplicate]
I dont understand why Mathematica cannot solve this equation:
Solve[Log[x^2 + 5] + 0.5 x + 1 == 0, x]
I get this error message:
Solve::inex: Solve was unable to solve the system with inexact coeffi …
1
vote
1
answer
87
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Problems solving a differential equation
I am trying to solve a differential equation:
$dN/dt = a*N*(90-N)$ with $N(0)=3$ and $N(11)=43$:
Using:
DSolve[{n'[t] == a*n[t]*(90 - n[t]), n[0] == 3}, n[t], t])
I get:
{{n[t] -> (90 E^(90 a …