Question

Please help. i dont understand what i have to do and how to get it. thank you

Answer 1

Answer:

$\left[\begin{array}{ccc}9\\10\\\end{array}\right]$

Step-by-step explanation:

Evaluate 3a by multiplying each element by 3

3a = 3 $\left[\begin{array}{ccc}2\\4\\\end{array}\right]$ = $\left[\begin{array}{ccc}3(2)\\3(4)\\\end{array}\right]$ = $\left[\begin{array}{ccc}6\\12&\\\end{array}\right]$, then

3a + b

= $\left[\begin{array}{ccc}6\\12\\\end{array}\right]$ + $\left[\begin{array}{ccc}3\\-2\\\end{array}\right]$ ← sum corresponding elements

= $\left[\begin{array}{ccc}6+3\\12-2\\\end{array}\right]$

= $\left[\begin{array}{ccc}9\\10\\\end{array}\right]$