Question
$36c^2- (5a + b)^2$
✓
Answer
$= (6c)^2- (5a + b)^2$
$[\because a^2- b^2= (a + b)(a - b)\}$
$= (6c + 5a + b)(6c - 5a - b)$
$[\because a^2- b^2= (a + b)(a - b)\}$
$= (6c + 5a + b)(6c - 5a - b)$
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