25x^2y^2 - 49
factorise it
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25x²y²-49
=(5)²(x)²(y)²-(7)²
=(5xy)²-(7)²
(a²-b²=(a+b)(a-b))
=(5xy+7)(5xy-7)
=(5)²(x)²(y)²-(7)²
=(5xy)²-(7)²
(a²-b²=(a+b)(a-b))
=(5xy+7)(5xy-7)
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