A 4-ft vertical post casts a 12-in shadow at the same time a nearby cell phone tower casts a 126-ft shadow. How tall is the c
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Answer:
Given:
Matrix A is of order 3 × 3 and Matrix B is of order 3 × 3
To Show:
- Matrix AB = A , BA = B
Formula Used:
If A is a matrix of order a×b and B is a matrix of order c×d , then matrix AB exits and is of order a×d , if and only if b = c.
If A is a matrix of order a×b and B is a matrix of order c×d , then matrix BA exits and is of order c×b , if and only if d = a.
For Matrix AB, a = 3, b = c = 3, d = 3 , thus Matrix AB is of order 3×3
For Matrix BA, a = 3, b = c = 3, d = 3 , thus Matrix BA is of order 3 × 3