Factorise :
4 + y - 14y2
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= 4 + (8 - 7)y - 14y2
= 4 + 8y - 7y - 14y2
= (4 + 8y) - (7y + 14y2)
= 4(1 + 2y) - 7y(1 + 2y)
= (1 + 2y)(4 - 7y)
Hence,4 + y - 14y2 = (1 + 2y)(4 - 7y)
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6 + 7b - 3b2
5 + 7x - 6x2
5 + 3a - 14a2
(2a + b)2 + 5(2a + b) + 6