Question

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Answer 1

a)
`3(3a + 2b)`

b)
`5c - 3d`

Explanation:

a)
`4a + 7b + 5a - b`

Lets arrange all like terms.

`= > 4a + 5a + 7b - b`

`= > 9a + 6b`

Taking 3 common from the terms,

`= > 3(3a + 2b)`

b)
`6c + 4d - c - 7d`

Lets arrange all like terms.

`= > 6c - c + 4d - 7d`

`= > 5c - 3d`

Answer 2

9a + 6b and 5c - 3d

Explanation:

(a)

4a + 7b + 5a - b ← collect like terms

= (4a + 5a) + (7b - b)

= 9a + 6b

(b)

6c + 4d - c - 7d ← collect like terms

= (6c - c) + (4d - 7d)

= 5c - 3d