1. The problem statement, all variables and given/known data Determine which of the formulas hold for all invertible nhttp://msr02.math.mcgill.ca/webwork2_files/jsMath/fonts/cmsy10/alpha/144/char02.png [Broken]n matrices A andB A. 7A is invertible B. ABA^−1=B C. A+B is invertible D. (A+B)2=A2+B2+2AB E. (A+A^−1)^8=A8+A−8 F. (ABA^−1)^3=AB3A−1 2. Relevant equations 3. The attempt at a solution I think 1 should be true and c should be true. Those are for certain. The rest, I don't know how.