25(x-y)sq-36(x-2y)sq factorise
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Answer :
Now,
25 (x + y)² - 36 (x - 2y)²
= {5 (x + y)}² - {6 (x - 2y)}²
= (5x + 5y)² - (6x - 12y)²
= (5x + 5y + 6x - 12y) (5x + 5y - 6x + 12y),
using the identity
a² - b² = (a + b) (a - b)
= (11x - 7y) (17y - x),
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