1.

Factorise:3ab + 3a + 2b + 2

Answer»

3ab + 3a + 2b + 2 

= [3 × a × b + 3 × a] + [2 × b + 2

= 3 × a [b + 1] + 2 [b + 1

= (b + 1) (3a + 2)



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