02:14
Student's Solutions Manual for College Algebra
Provide a proof for each of the following.
Show that $I_{3} A=A$ for $A=\left[\begin{array}{rrr}-2 & 4 & 0 \\ 3 & 5 & 9 \\ 0 & 8 & -6\end{array}\right]$ and $I_{3}=\left[\begin{array}{lll}1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1\end{array}\right]$ (This result, along with that of Example 1 , illustrates that the commutative property
holds when one of the matrices is an identity matrix.)