Question

Multiply the fourth row by $3$.
$\left[\begin{array}{cccc}3& 4& 2& 11\\ 9& 1& 0& 0\\ 0& 1& 0& 2\\ 0& 0& 6& 1\end{array}\right]$

• A. $0,0,18,3$
• B. $0,3,0,6$
• C. $0,0,24,4$
• D. $9,12,6,33$
• E. $0,0,12,2$

Answer 1

Answer: (A)

$0,0,18,3$

Fourth row = $0,0,6,1$
multiplying by $3$
$(0\times 3,0\times 3,6\times 3,1\times 3)$
$(0,0,18,3)$