Given $\displaystyle {A}={\left[\begin{array}{c} {1}\\{0}\\{4}\\-{2}\end{array}\right]}$ and $\displaystyle {B}={\left[\begin{array}{cccc} {6}&-{7}&-{1}&{8}\end{array}\right]}$ , find $\displaystyle {A}{B}$  and $\displaystyle {B}{A}$ .

$\displaystyle {A}{B}=$ Preview Question 6 Part 1 of 2  

$\displaystyle {B}{A}=$ Preview Question 6 Part 2 of 2  

Hint: Matrices need to be entered as [(elements of row 1 separated by commas), (elements of row 2 separated by commas), (elements of each row separated by commas)].

Example: $\displaystyle {C}={\left[\begin{array}{ccc} {1}&{2}&{3}\\{4}&{5}&{6}\end{array}\right]}$ would be entered as [(1, 2, 3), (4, 5, 6)]