Question

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

Answer 1

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

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]`