# NCERT Class 9 Mathematics Solutions: Chapter 9 – Algebraic Expressions and Identities Exercise 9.1 Part 2

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**Question: 3** Add the following:

(i)

(ii)

(iii)

(iv)

**Answer: 3**

**(i)**

Hence the sum is 0.

**(ii)**

Hence the sum is

**(iii)**

Hence the sum is

**(iv)**

Hence, the sum is

**Question: 4**

(a) Subtract from .

(b) Subtract

(C) Subtract from

**Answer:**

(a) Subtract from .

While subtracting, we need to remember signs are reversed after **–** sign once bracket is opened

(b) Subtract from

(c) Subtract from