factorise the following:
a^2-2ab+b^2-9c^2
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Answer:
(a-b+3c)(a-b-2c)
Step-by-step explanation:
(a-b)^2- (3c)^2
(a-b+3c)(a-b-2c) {by using (a^2-b^2)=(a+b)(a
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