4x^2-9y^2+20n+25 factorise this pls I need the step by step (it is urgent thanks) pls answer
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4x²-9y²+20n+25
= (4x²-9y²)+(20n+25)
= ((2x)²-(3y)²)+(5(4n+5))
= (2x+3y)(2x-3y) + 5(4n+5)
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