Factorise: 25x^2- 49y^2
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Answer:(5x-7y)(5x+7y)
Step-by-step explanation:
25x^2- 49y^2
= 5²x²-7²y²
=(5x)²- (7y)²
Use a²-b²=(a-b)(a+b)
So,. (5x-7y)(5x+7y)
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