Factorise by using formula: $4 (2 a + b)^{2} - (a - b)^{2}$

3 (a + b) (a + b)

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3 (5 a + b) (b)

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3 (5 a + b) (a + b)

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3 (5 a - b) (a + b)

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Solution

The correct option is C $3 (5 a + b) (a + b)$
$F a c t o r i z i n g {4 (2 a + b)}^{2} - (a - b)^{2}, = (4 a + 2 b + a - b) (4 a + 2 b - a + b) = 3 (5 a + b) (a + b)$

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