# NCTB Class 7 Math Chapter Four Exercise 4.2 Solution

NCTB Class 7 Math Chapter Four Exercise 4.2 Solution by Math Expert. Bangladesh Board Class 7 Math Solution Chapter 4.2 “Multiplication & Division of Algebraic Expressions” Exercise 4.2 Solution.

 Board NCTB Class 7 Subject Math Chapter 4.2 Chapter Name “Multiplication & Division of Algebraic Expressions” Exercise 4.2 Solution

### Exercise:- 4.2

(1) Solution:-

45a4÷ 9a2

= 45a4/9a2

= 5a2

(2) Solution:-

-24a5÷ 3a2

= – 24a5/3a2

= -8a3

(3) Solution:-

30a4 x3 ÷ 6a2 x

= – 30a4 x3 / 6a2 x

= -5 a2 x2

(4) Solution:- – 28 x4 y3 z2 ÷ 4x y z

= – 28 x4 y3 z2 /4x y2 z

= – 7 x3 y z

(5) Solution:-

-36a3 z3 y2 ÷ (-4ayz)

= – 36a3 z3 y2/- 4ayz

= 9a2y z2

(6) Solution:-

– 22 x3 y2z÷ – 2xyz

= – 22 x3 y2 z/ – 2xy z

= 11 x2 y

(7) Solution:-

(3a3 b3– 2a2 b3) ÷ a2b2

= 3a3b2 – 2a2 b2 /a2 b2

= 3 a3 b2 /a2 b2 – 2a2 b3 /a2 b2

= 3a- 2b

(8) Solution:-

(36 x4 y3 + 9x5 y2) ÷ 9xy

= 36 x4 y3 /9 x y+ 9x5 y2 /9xy

= 4 x3 y2 + x4 y

(9) Solution:-

(a3 b4– 3a7 b7) ÷ – a3 b3

= a3 b4 / a3 b3 – 3a7 b7/ a3 b3

= b- 3a4 b4

(10) Solution:-

(6a b -9a b) V 3a b

= 6a b/3a b – 9a b/3a b

= 2a b- 3a b

(11) Solution:-

(15x3 y3 + 12x3 y2– 1 x5 y3 ) ÷ 3x2 y2

= 15x3 y3/ 3x2 y2 + 12x3 y2 / 3x2 y2 – 12x3 y2/ 3x2 y2

= 5xy+ 4x – 4x3 y

(12) Solution:-

(6x8 y6 z- 4x4 y3 z2 + 2x2y2z2) ÷ 2 x2 y2 z

= 6x8 y6 z/ 2 x2 y2 z – 4x4 y3 z2/ 2 x2 y2 z+2x2y2z2 /2 x2 y2 z

= 3 x6 y4 – 2 x2z + z

(13) Solution:-

(24a2 b2 c- 15a4 b4 c4 – 9a2 b6 c2) ÷ (-3ab2)

= 24a2 b2 c /-3ab2– 15a4 b4 c4 /-3ab2– 9a2 b6 c2/ -3ab2

= – 8a c + 5a3 b2 c4+ 3ab4 c2

(14) Solution:-

(a3 b3 + 2a2 b3) ÷ (a+2b)

= a3 b3/ a+2b + 2a2 b3/ a+2b

= a2 b2

(15) Solution:-

(6x2 +x-2) ÷ (2x -1)

= 6x2 +x-2/2x-1

= 3x+2

Updated: December 15, 2020 — 10:37 am

1. There is one math missing and that is 34 number.I like all the other math but some of the answers ar3 incorect and the handwriting is bad.

1. We will post it soon

1. Handwriting not clear.plz clear write.

1. Ok Mahim We are thinking to give Video class also

2. You still haven’t posted it

2. No.32 is missing

3. sir where is 33,34,35 ?

4. Where is 34 and 35