Question

add 12ab+1, ab-4, 8ab-5

Answer 1

12ab+ab+8ab+1-4-5
=21ab-8

Is your answer

Answer 2

Hii..

Here js ur answer :--

12ab+1+ab-4+8ab-5

Combining like terms we get ,

12ab+ab+8ab+1-4-5

= 21ab-8

Hope it helps!!