Q. 113.6( 5 Votes )

Factorise each of th

Answer :

(i) 25x2y2 - 20xy2z + 4y2z2
    = (5xy)2 - 2൵ × 2yz + (2yz)2
    = (5xy + 2yz)2
    = y2 (5x + 2z)2
(ii) 4x2 - 4x + 7
     = (2x)2 + 2(2) ×+()2

= (2x +)2 
(iii) 
    = 
(iv) 4a2 + 12ab + 9b2 - 8a - 12b
     = (4a2 + 12ab + 9b2) - 4(2a + 3b)
     = (2a)2 + 2 × 2a × 3b + (3b)2 - 4(2a + 3b)
     = (2a + 3b)2 - 4(2a + 3b)
     = (2a + 3b) (2a + 3b - 4)

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