# Math Help - distributive property

1. ## distributive property

Hello guys i hv a doubt, the only distributive property i know in Linear Algebra is: A(C+B) = AC+BC

I wan to know if (A+B).(A-B) =
a²-b² is valid

But the matrix A is order 4x2 and the matrix B order 2x4

2. ## Re: distributive property

Originally Posted by Chipset3600
Hello guys i hv a doubt, the only distributive property i know in Linear Algebra is: A(C+B) = AC+BC
I wan to know if (A+B).(A-B) = [LEFT]a²-b² is valid
But the matrix A is order 4x2 and the matrix B order 2x4
None of that is valid. You cannot even add $A_{4\times 2}+B_{2\times 4}~!$