Factorise :
5 + 3a - 14a2
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= 5 + (10 - 7)a - 14a2
= 5 + 10a - 7a - 14a2
= (5 + 10a) - (7a + 14a2)
= 5(1 + 2a) - 7a(1 + 2a)
= (1 + 2a)(5 - 7a)
Hence,5 + 3a - 14a2 = (1 + 2a)(5 - 7a)
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5 + 7x - 6x2
4 + y - 14y2
(2a + b)2 + 5(2a + b) + 6
1 - (2x + 3y) - 6(2x + 3y)2