Question:
Factorise the following expressions: 10ab + 4a + 5b + 2
(A) (5b+2) (2a+1)
(B) (6b+3) (3a+1)
(C) (5b+6) (5a+2)
(D) (6a+5) (4a+1)
Solution
10ab + 4a + 5b + 2
= 5b (2a + 1) + 2(2a + 1)
= (5b +2) (2a + 1)
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