what's the program mistake?

clear all clc; syms x A=[x 2 1;1 0 -x;5 1 x]; b=det(A) r=solve('b=0','x')

Answer 1

[MA]

r=solve(b)

Answer 2

[Mischa Kim]

Hello Ali, use instead

 r = solve(b==0)

[MA]

Hi,it doesn't work

[Mahdi]

Why isn't it working? What's the error that you're getting?

Answer 3

[Mahdi]

Try this?

clear all 
clc; 
syms x 
A=[x 2 1;1 0 -x;5 1 x]; 
b=det(A) 
r=eval(solve(b==0))

[MA]

it's wrong

[Mahdi]

You will need to provide more information why you're not getting the answer that you want. Please read this.

[MA]

error