**Chapter 6.3 Solution West Bengal Board : Class 7 Mathematics**

West Bengal Board Class 7 Math Solution full Exercise 6.3 by Experts. Here in this page WB Board Class 7 Student can find Ganit Prabha Class 7 Math Chapter 6 বীজগাণিতিক প্ৰক্ৰিয়া (Algebraic Process) **Exercise 6.3**** Solution.**

Board |
WB Board |

Class |
7 (Seven) |

Subject |
Mathematics |

Book Name |
Ganit Prabha |

Chapter |
6 |

Chapter Page Number on Book |
108 and 109 |

Exercise Number |
6.3 |

**(1)**

(i) 3a x 4b = **12ab**

(ii) 12ab ÷ 3a = **4b**

(iii) 12ab ÷** 3** = 4ab

(iv) (-x^{2}) x X = **-x ^{3}**

(v) 9x^{2 }÷ 3x^{2 }= **3**

(vi) x^{2} x x^{2 }=** x ^{4}**

(vii) x^{2} x **1/ x ^{2}** = 1

(viii) 0 ÷ ab =** 0**

(ix) 4a^{2}b^{2}c^{2} x **0 **= 0

(x) 3ab ÷ **3b** = a

(xi) x^{0} x y = **y**

(xii) x ÷ 0 = **no value**

**(2) **

(a) 2x^{2} x (-3y) x 6z

= -6x^{2}y x 6z

= – 36 x^{2}yz

(b) 7xy^{2} x 8 x^{2}y x Xy

= 56x^{3}y^{3} x Xy

= 56 x^{4}y^{4}

(c) (-3a^{2}) x (4a^{2}b) x (-2)

= -12a^{3}b x (-2)

= 24 a^{3}b

(d) (-2mn) x 1/6 m^{2}n^{2} x 13m^{4}n^{4}

= -1/3 m^{3}n^{3 }x 13m^{4}n^{4}

= -13/3 m^{7}n^{7}

(e) 2/3 x^{2}y x 3/5xy^{2}

= 2/5 x^{3}y^{3}

(f) -18/5 x^{2}z) x (25/6 xz^{2}y)

= – (18/5 x 25/6) x^{3}yz^{3}

= -15 x^{3}yz^{3}

(g) (-3/5 s^{2}t) x (15/7 st^{2}u) x (7/9 su^{2})

= (-3/5 x 15/7 x 7/9) s^{4}t^{3}u^{3}

= – 3s^{4}t^{3}u^{3}

(h) (4/3 x^{2}yz) x (1/3 y^{2}zx) x (-6xyz^{2})

= (4/3 x 1/3 x -6) x^{4}y^{4}z^{4}

= -8/3 x^{4}y^{4}z^{4}

(i) 4a (3a+7b)

= 12a^{2} + 28ab

(j) 8a^{2} x (2a + 5b)

= 16 a^{3} + 40 a^{2}b

(k) -17 x^{2 }x (3x-4)

= -51x^{3} + 68 x^{2 }

(l)2/3abc (a^{2 }+b^{2 }-3c^{2})

= 2/3 a^{3}bc + 2/3b^{3}ac – 2/a abc^{3}

(m) 2 x 5x (10x^{2}y-100xy^{2})

= 100x^{3}y – 1000 x^{2} y^{2}

(n) (2x+3y) (5x-y)

= 10x^{2 }– 2xy +15xy – 3 y^{2}

= 10x^{2}+13xy – 3y^{2}

(o) (a^{2}-b^{2}) (2b-6a)

= 2 a^{2}b – 6a^{3} – 2b^{3} + 6ab^{2}

(p) (x+2) (3x+1)

= 3x^{2} + x + 6x + 2

= 3x^{2} + 7x + 2