Further Pure Equations to Learn

Question 1

Inverse of 2x2 matrix (a, b, c, d)

Answer 1

(1/determinant)(d -b -c a)

d and a swap places, and b and c become negative

Question 2

(ABCDE)^-1 in terms of A^-1, B^-1, C^-1 etc

Answer 2

E^-1D^-1C^-1B^-1A^-1