Hello, i am unsure what i am wanted to do for part b?

[frank fjord]

does anyon know?

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[wild estuary]

Maybe it’s A * adj(A) if that’s the case use the formula A * adj(A)=det(A) * I2

Because adj(A)=Com^T(A)

[frank fjord]

Wait is that i2 or 12

[frank fjord]

ive done it now

[frank fjord]

sorry to ask but do you know this one

i feel its some rule is hould now

[wild estuary]

here you can take the last column and subtract it to each column

then using cofactor expansion youll have det(A)=(-1)^(4+1)* x * det(B) +0+0+0 with B=[0,0,w;(w-c),0,c;(w-d),(c-d),d]

here you can once again use cofactor expansion to get det(B)=(-1)^4 * w *(-c(c-d))

so finally x(w(c(c-d))=xw(c^2-cd))

hmmm i dont have any paper so im not sure but i think thats the general idea

[wild estuary]

yes its the identity matrix

[wild estuary]

Did you get it ?