Factorise (i) 2 a^ 2 + b c ─ 2 a b ─ a c
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2a² + bc - 2ab -ac
=2a²-2ab-ac +bc
=2a(a-b)-c(a-b)
=(2a-c)(a-b)
∴Answer=(2a-c)(a-b)
=2a²-2ab-ac +bc
=2a(a-b)-c(a-b)
=(2a-c)(a-b)
∴Answer=(2a-c)(a-b)
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