a + b = b + a = 0, then a and b are ____ inverse of each other.
Matrices A and B will be inverse of each other only if
A. AB = BA
C. AB = 0, BA = I
B. AB = BA = 0
D. AB = BA = I
Fill in the blanks:
a : b and c : d are in inverse proportion, then a : b = ...........
If a - b = 0, then -b is the additive inverse of a.