7. Factorise
1)
25x²-36y²
2)2ab-a²-b²+1
3)36a²-12a+1-25b²
4)4x²-9y²-2x-3y
Answers
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2
Answer:
1. 5x-3y. 2. (a-b)+1. 4. 2x(2x)-3y(3y)= (2x+3y)(2x-3y)
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