6. Use the column method to find the following products
(a) (a +2b) (2a + b)
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jiwhwhhwheh mmsnhshs
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a+2b
2a+b
2a^2+ 4ab
ab+ 2b^2
=2a^2+4ab+ab+2b^2
=×a^2 + 5ab + 2b^2
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