Question

3xy - 5 and 9xy - Add the given expressions.

Answer 1

According to the question, we have to add the expressions: (3xy - 5) and (9xy).

Out of the two terms (3xy - 5) and (9xy) it is evident that the constant doesn't have a pair to be added with but the term 3xy has a similar term 9xy to be added with.

Hence after adding the two similar terms: (3xy) and (9xy) first, we get 3xy + 9xy = 12xy.

Now we are left to add with the constant and the sum i.e. 12xy and -5

So, we get 12xy - 5. Since there are no common terms in between so we cannot further resolve it.

Therefore, on adding (3xy - 5) and (9xy) we get (12xy - 5) [Ans]

Answer 2

Given expressions are

3xy - 5 , 9xy

Addition of given expressions

= 3xy - 5 + 9xy

= 3xy + 9xy - 5

= 12xy - 5

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