EM-1558

Factorising by grouping

E Math · Secondary 4 · Easy · Factorising by grouping

Factorise completely

3a^2 - 6ab - a + 2b

.

$(a-2b)(3a-1)$
$(a+2b)(3a-1)$
$(3a+1)(a-2b)$
$(3a+1)(a+2b)$

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