Factorise each of the following expression
25p²+81q²-90pq
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Answer:
(5p-9q)²
Step-by-step explanation:
25p²-90pq+81q²
(5q)²-2(5p)(9q)+(9q)²
(5p-9q)² ———> (a-b)²=a²-2ab+b²
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