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:-**

45a^{4}÷ 9a^{2}

= 45a^{4}/9a^{2}

= 5a^{2}

**(2) Solution:-**

-24a^{5}÷ 3a^{2}

= – 24a^{5}/3a^{2}

= -8a^{3}

**(3) Solution:-**

30a^{4} x^{3} ÷ 6a^{2} x

= – 30a^{4} x^{3} / 6a^{2} x

= -5 a^{2} x^{2}

**(4) Solution:-** – 28 x^{4} y^{3} z^{2} ÷ 4x y z

= – 28 x^{4} y^{3} z^{2} /4x y^{2} z

= – 7 x^{3} y z

**(5) Solution:-**

-36a^{3} z^{3} y^{2} ÷ (-4ayz)

= – 36a^{3} z^{3} y^{2}/- 4ayz

= 9a^{2}y z^{2}

**(6) Solution:-**

– 22 x^{3} y^{2}z÷ – 2xyz

= – 22 x^{3} y^{2} z/ – 2xy z

= 11 x^{2} y

**(7) Solution:-**

(3a^{3} b^{3}– 2a^{2} b^{3}) ÷ a^{2}b^{2}

= 3a^{3}b^{2} – 2a^{2} b^{2} /a^{2} b^{2}

= 3 a^{3} b^{2} /a^{2} b^{2} – 2a^{2} b^{3} /a^{2} b^{2}

= 3a- 2b

**(8) Solution:-**

(36 x^{4} y^{3} + 9x^{5} y^{2}) ÷ 9xy

= 36 x^{4} y^{3} /9 x y+ 9x^{5} y^{2} /9xy

= 4 x^{3} y^{2} + x^{4} y

**(9) Solution:- **

(a^{3} b^{4}– 3a^{7} b^{7}) ÷ – a^{3} b^{3}

= a^{3} b^{4} / a^{3} b^{3} – 3a^{7} b^{7}/ a^{3} b^{3}

= b- 3a^{4} b^{4}

**(10) Solution:- **

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

= 6a b/3a b – 9a b/3a b

= 2a b- 3a b

**(11) Solution:-**

(15x^{3} y^{3} + 12x^{3} y^{2}– 1 x^{5} y^{3} ) ÷ 3x^{2} y^{2}

= 15x^{3} y^{3}/ 3x^{2} y^{2} + 12x^{3} y^{2 }/ 3x^{2} y^{2} – 12x^{3} y^{2}/ 3x^{2} y^{2}

= 5xy+ 4x – 4x^{3} y

**(12) Solution:- **

(6x^{8} y^{6} z- 4x^{4} y^{3} z^{2} + 2x^{2}y^{2}z^{2}) ÷ 2 x^{2} y^{2} z

= 6x^{8} y^{6} z/ 2 x^{2} y^{2} z – 4x^{4} y^{3} z^{2}/ 2 x^{2} y^{2} z+2x^{2}y^{2}z^{2 }/2 x^{2} y^{2} z

= 3 x^{6} y^{4} – 2 x^{2}z + z

**(13) Solution:- **

(24a^{2} b^{2} c- 15a^{4} b^{4} c^{4} – 9a^{2} b^{6} c^{2}) ÷ (-3ab^{2})

= 24a^{2} b^{2} c /-3ab^{2}– 15a^{4} b^{4} c^{4} /-3ab^{2}– 9a^{2} b^{6} c^{2}/ -3ab^{2}

= – 8a c + 5a^{3} b^{2} c^{4}+ 3ab^{4} c^{2}

**(14) Solution:-**

(a^{3} b^{3} + 2a^{2} b^{3}) ÷ (a+2b)

= a^{3} b^{3}/ a+2b + 2a^{2} b^{3}/ a+2b

= a^{2} b^{2}

**(15) Solution:-**

(6x^{2} +x-2) ÷ (2x -1)

= 6x^{2} +x-2/2x-1

= 3x+2

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.

We will post it soon

Handwriting not clear.plz clear write.

Ok Mahim We are thinking to give Video class also

You still haven’t posted it

right

No.32 is missing

sir where is 33,34,35 ?

Where is 34 and 35