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Algebraic Identities

select a suit...

Question

select a suitable identity and find the following products
$(2 b - a) (2 b + c)$

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Solution

$(2 b - a) (2 b + c)$

$= 2 b \cdot 2 b - a \cdot 2 b + c \cdot 2 b - a \cdot c$

$= 4 b^{2} - 2 a b + 2 b c - a c$

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