Class 8 Maths NCERT Solutions for Chapter – 9 Algebraic Expressions and Identities Ex – 9.4

Algebraic Expressions and Identities

Question 1.
Multiply the binomials :
(i)
 (2x + 5) and (4x – 3)
(ii) (y – 8) and (3y – 4)
(iii) (2.5l – 0.5m) and (2.5l + 0.5m)
(iv) (a + 3b) and (x + 5)
(v) (2pq + 3q2) and (3pq – 2q2)
(vi) \left( \frac { 3 }{ 4 } { a }^{ 2 }+3{ b }^{ 2 } \right) and\quad 4\left( { a }^{ 2 }-\frac { 2 }{ 3 } { b }^{ 2 } \right)

Solution:
NCERT Solutions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities 16
NCERT Solutions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities 17

Question 2.
Find the product :
(i)
 (5 – 2x)(3 + x)
(ii) (x + 7y)(7x – y)
(iii) (a2 + b)(a + b2 )
(iv) (p2 – q2)(2p + q)

Solution:
NCERT Solutions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities 18

Ex 9.4 Class 8 Maths Question 3.
Simplify :
(i) (x2 – 5)(x + 5) + 25
(ii) (a2 +5)(b3 +3)+ 5
(iii) (t +s2)(2 – s)
(iv) (a + b)(c – d) + (a – b)(c + d) + 2 (ac + bd)
(v) (x + y)(2x + y)+ (x + 2y)(x – y)
(vi) (x + y)(x2 – xy + y2)
(vii) (1.5x – 4y) (1.5x + 4y + 3) – 4.5x + 12y
(viii) (a + b + c)(a + b – c)
Solution:
NCERT Solutions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities 19
NCERT Solutions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities 20
NCERT Solutions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities 21

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus cursus rutrum est nec suscipit. Ut et ultrices nisi. Vivamus id nisl ligula. Nulla sed iaculis ipsum.