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Trying to Solve quadratic inequalities

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Hello, I am a new user of Matlab and I am trying to solve the following inequality
I tried to solve it with the code bellow and as you can see the result is wrong. I am seeking for intervals. What should I do?
syms x
ineq = x^2-2*x+7>12;
sol = solve(ineq, x)
sol = 

Risposta accettata

Torsten
Torsten il 31 Dic 2023
Modificato: Torsten il 31 Dic 2023
Don't expect that MATLAB succeeds for complicated systems of quadratic inequalities. But for this simple one, it returns a solution:
syms x
ineq = x^2-2*x+7>12;
sol = solve(ineq, x, 'ReturnConditions',1);
sol.conditions
ans = 
  1 Commento
Athanasios Paraskevopoulos
Thank you very much. I am a mathematician and I would like to put in my teaching some examples through Matlab. I am exploring what possibilities this program can give me and at the same time learn to use it for my PhD.

Accedi per commentare.

Più risposte (1)

John D'Errico
John D'Errico il 31 Dic 2023
Modificato: John D'Errico il 31 Dic 2023
syms x
ineq = x^2-2*x+7>12;
sol = solve(ineq, x,'returnconditions',true)
sol = struct with fields:
x: [2×1 sym] parameters: x conditions: [2×1 sym]
sol.x
ans = 
sol.conditions
ans = 
The result is two half-infinite intervals.

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