help me solve this simple matrices determinant

[farizriz23]

how to find ω using mathcad??

1.

2.

[AlanStevens · Accepted solution]

Like so:

Mathcad doesn't agree with your second example!

Alan

[LucMeekes]

Success!
Luc

[Werner_E]

The snippet doesn't claim that the expression below the determinant IS the determinant, but even if we normalize in the equation the coefficient of omega^4 to 1 we get a different equation.
So something is wrong in the snippet or the equation does not relate to the determinant above.

[Werner_E]

Just a fun a way to find the zeros without using the symbolics.

You can use the numeric "root" function or alternatively a solve block to do the job.