Question

Factor this expression completely.

ab + 4 + a + 4b

Answer 1

Greetings!

Rearrange.

`ab+4+a+4b`

`ab+a+4+4b`
Factor by grouping.

`a(b+1)+4(1+b)`

`a(b+1)+4(b+1)`
Find the GCF.

`(b+1)(a+4)`

Hope this helped.
-Benjamin