(2x + 5y)2 - 1 - Vidyadip

Question

$(2x + 5y)2 - 1$

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Answer

$(2x + 5y)2 - 1$
$= (2x + 5y + 1)(2x + 5y - 1)$
$\{\because a2 - b2 = (a + b)(a - b) \}$

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