Pleasee helpp!!
Tell whether the product AB is defined for A4x5 andB5x3. If yes, give the product's dimensions as the following example: 2x3. If no, write no in the box.

Question

Pleasee helpp!! 
Tell whether the product AB is defined for A4x5 andB5x3. If yes, give the product's dimensions as the following example: 2x3. If no, write no in the box.

jim_thompson5910 · Answer

matrix A has 4 rows and 5 columns

matrix B has 5 rows and 3 columns

jim_thompson5910 · Answer

Since 

# of columns in matrix A = # of rows in matrix B

this means that AB is defined and it will be a 4x3 matrix

The '4' comes from the "4x5" in matrix A and the '3' comes from the "5x3" in matrix B

jim_thompson5910 · Answer

here is a visual way to do this

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