Symmetric Matrix Eigenvalue Problems

[tired ginkgo]

Could someone explain me how do we find the result what i highlighted by rectangle please ?

[eternal swallow]

do you know how to find the determinant of a matrix?

[tired ginkgo]

yes for sure

but the result is not determinant which inside of the rectangle

[eternal swallow]

how so?

what did you get as the determinant of that matrix?

[tired ginkgo]

let me solve it again pls

[eternal swallow]

👍

[tired ginkgo]

but we dont need

how the result can contain a x^3

look at it just like that

[eternal swallow]

what is the method you're using to find the determinant of the matrix?

[tired ginkgo]

let me draw it in paint

[eternal swallow]

okay!

[tired ginkgo]

but wait

i forgot to multiple a0,a1,a2 by minors

sorry man i am still dizzy

thx much for help ❤️

[eternal swallow]

no problem!!

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