Precalculus : Solve a System of Equations Using the Multiplicative Inverse

Study concepts, example questions & explanations for Precalculus

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Example Questions

Example Question #1 : Inverses Of Matrices

What is the inverse of the identiy matrix   ?

Possible Answers:

The identity matrix 

Correct answer:

The identity matrix 


By definition, an inverse matrix is the matrix B that you would need to multiply matrix A by to get the identity. Since the identity matrix yields whatever matrix it is being multiplied by, the answer is the identity itself.

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