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Q.

Work out the following divisions. 

(i) (10x – 25) ÷ 5 

(ii) (10x – 25) ÷ (2x – 5) 

(iii) 10y(6y + 21) ÷ 5(2y + 7) 

(iv) 9x 2 y 2 (3z – 24) ÷ 27xy(z – 8) 

(v) 96abc(3a – 12) (5b – 30) ÷ 144(a – 4) (b – 6)

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Detailed Solution

We know that, Factorization means finding out the factors of the given algebraic expression

(i) (10x – 25) ÷ 5 :

let (10x – 25) can be written as 

 (10x – 25) = 5 × 2 × x - 5 × 5  

= 5 (2x - 5)

Thus, we get 

 (10x – 25) ÷ 5 = 5 (2x - 5) /  5

= 2x - 5

(ii) (10x – 25) ÷ (2x – 5) :

let (10x – 25) can be written as 

 (10x – 25) = 5 × 2 × x - 5 × 5  

= 5 (2x - 5)

Thus, we get 

 (10x – 25) ÷ (2x – 5) = 5 (2x - 5) / (2x – 5)

= 5

(iii) 10y(6y + 21) ÷ 5(2y + 7) :

let 10y(6y + 21) can be written as 

10y(6y + 21) = 5 × 2 × y × ( 6 × y +  7 × 3) 

= 30y (2y + 7)

Thus, we get 

10y(6y + 21) ÷ 5(2y + 7) =30y (2y + 7)/ 5(2y + 7)

= 6y 

(iv) 9x 2 y 2 (3z – 24) ÷ 27xy(z – 8) :

let  9x 2 y 2 (3z – 24) can be written as 

 9x 2 y 2 (3z – 24)= 3 × 3 ×  x ×  x ×  y ×  y ×  ( 3 × z -  2 × 2 × 2× 3) 

= 27x 2 y 2  ( z - 8)

9x 2 y 2 (3z – 24) ÷ 27xy(z – 8) = 27x 2 y 2  ( z - 8)/ 27xy(z – 8)

= xy 

(v) 96abc(3a – 12) (5b – 30) ÷ 144(a – 4) (b – 6) :

let 96abc(3a – 12) (5b – 30)  can be written as 

96abc(3a – 12) (5b – 30) = 96abc × (3 ×  a -  2 ×  2 ×  3) ×  ( 5 × b -  5 × 2× 3) 

= 1440abc (a- 4) (b - 6)

96abc(3a – 12) (5b – 30) ÷ 144(a – 4) (b – 6) = 1440abc (a- 4) (b - 6)/ 144(a – 4) (b – 6)

= 10abc 

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