Order of Operations for Matrices in Scientific Computing

[shamieh]

When I am dealing with matrices and the question says compute: $4A +B$ (where $A$ and $B$ are some matrices..) should I assume that they are implying I use the normal mathematical order of operations or is it different? For example should I assume they are saying $(4*A) + B$ or $4(A+B)$

 

[MarkFL]

$4A+B$ means that 4 and $A$ are to be multiplied, and then $B$ added to the result, as you likely suspected. :D