Q27 of 30 Page 2

Factorise
(i) 9x2 + 30xy + 25y2
(ii) 9x2 – 30xy + 25y2

(i) 9x2 + 30xy + 25y2   
    = (3x)2 + 2(3x)(5y) +(5y)2  
    = (3x +5y)2  

(ii) 9x2 – 30xy + 25y2  
   = (3x)2 – 2(3x)(5y) + (5y)2 
    = (3x – 5y)2

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