How to factorise (a² +96² - 6ab)- 4 c²
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(a² + 9b² - 6ab) - 4c²
[ a² + (3b)²-2(3ab)] - 4c²
(a-3b)² - 4c²
Therefore,
(a-3b)² - (2c)²
a²-b² = (a+b)(a-b)
(a-3b+2c)(a-3b-2c)
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