Two theorems are related to Exercise 3.4 based on the inverse of a matrix. Theorem three states uniqueness of inverse which means that the inverse of a square matrix is unique if it exists and theorem four which states that if A and B are invertible matrices having the same order, then  (AB)⁻¹ = B⁻¹ A⁻¹. Students can understand the theorems by solving the textbook questions given in Exercise 3.4. Students can get solutions for all textbook questions for Exercise 3.4 on Vedantu.