Factorise: 25a*2 - 9b*2
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25a^2 - 9b^2
=(5a)^2-(3b)^2
We know that a^2-b^2=(a+b)(a-b)
=(5a+3b)(5a-3b)
=(5a)^2-(3b)^2
We know that a^2-b^2=(a+b)(a-b)
=(5a+3b)(5a-3b)
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