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Question
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
28ay2 – 175ax2
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Solution
We have,
28ay2 – 175ax2 = 7a(4y2 – 25x2)
= 7a[(2y)2 – (5x)2]
= 7a(2y – 5x)(2y + 5x)
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