# What is the identity of matrix transformation?

When A is an invertible matrix, there is an A−1 matrix that represents a transformation that undoes A, since its composition with A is the identity matrix. In some practical applications, the investment can be calculated using general inversion algorithms or by performing inverse operations (which have an obvious geometric interpretation, such as turning in the opposite direction) and then composing them in reverse order. When A is an invertible matrix, there is an A−1 matrix that represents a transformation that undoes A, since its composition with A is the identity matrix. In some practical applications, the investment can be calculated using general inversion algorithms or by performing inverse operations (which have an obvious geometric interpretation, such as turning in the opposite direction) and then composing them in reverse order. Reflection matrices are a special case because they are their own inverses and don't need to be calculated separately. To increase the horizontal or vertical size of the object, the value a or d must be changed, respectively, and the other values must remain as in the identity matrix. ##### Terri Benigno

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