Hello, teddybear67!

1) Given that: . ,

find the matrix such that , where is the 2×2 identity matrix

Let

Then: .

. .

And we have: .

The expansion begins: .2) The coefficient of in the expansion of is 3 times the coefficient of

Find the value of

The coefficient of is: .

The coefficient of is: .

We are told that: .

Assuming , multiply by

Divide by