I have got the determinant to be -1-i
and for 1/(-1-i) =-1+i? im unsure if thats correct
How would I do matrix multiplication for this 2x2 x 1x1
The determinant is not . You need to re-do that part of the calculation (or post your working so that the mistake can be located). Once you have the correct inverse you have to do the matrix multiplication. This is not dificult - it is simply tedious and it's your job to do it (however, I am willing to check your answer once you get it).
This is not correct. Do you know how to multiply two matrices? You need to review that ... Read this: Scalar and Matrix Multiplication
Then try doing the multiplication again.