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