# NCERT Class 9 Mathematics Solutions: Chapter 9 – Algebraic Expressions and Identities Exercise 9.3 Part 3

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**Question 4:**

(a) Simplify: and find values for

(b) Simplify: and find its value for

**Answer:**

**(a)**

, put the value of

Put the value of

**(b)**

**(i)** For,

**(ii)** For

**(iii)** For

**Question 5:**

(a) Add:

(b) Add:

(c) Subtract:

(d) Subtract:

**Answer: 5**

**(a)**

**(b)**

=

**(c)**

**(d)**