
What is the multiplicative inverse of a matrix?
Answer
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Hint: In this problem we need to calculate the multiplicative inverse of a matrix. First, we will assume a matrix and the inverse of the matrix as . When we have multiplied a matrix with the given matrix, if we get the identity matrix as a result then we can say that the multiplied matrix is called a multiplicative inverse of the given matrix. So, we can write the mathematical form of the statement in terms of and . Now we will simplify the equation to get the value of which is our required result.
Complete step by step solution:
Let us assume a matrix which is named as .
Let the multiplicative inverse of the matrix is .
We know that the product of the matrix and its multiplicative inverse which is should be equal to the identity matrix. So, we can write this mathematically as
Dividing the above equation with on both sides, then we will get
Cancelling the term which is in both numerator and denominator on left hand side, then we will have
We can write the term as . Substituting this value in the above equation, then we will get
We know that the product of any matrix with identity matrix will be equal to a multiplied matrix. So, we can write the above equation as
Hence the multiplicative inverse of the matrix is equal to the inverse of that matrix .
Note: The terms inverse of the matrix and multiplicative inverse of the matrix are used in the same meaning. So, whenever someone asked to calculate the multiplicative inverse then simply calculate the inverse of the matrix from the formula .
Complete step by step solution:
Let us assume a matrix which is named as
Let the multiplicative inverse of the matrix
We know that the product of the matrix
Dividing the above equation with
Cancelling the term
We can write the term
We know that the product of any matrix with identity matrix will be equal to a multiplied matrix. So, we can write the above equation as
Hence the multiplicative inverse of the matrix
Note: The terms inverse of the matrix and multiplicative inverse of the matrix are used in the same meaning. So, whenever someone asked to calculate the multiplicative inverse then simply calculate the inverse of the matrix from the formula
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