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| 1. |
Factorize `81x^(2) - 225 y^(2)` |
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Answer» Let `a = 9x and b = 15y` `a^(2) - b^(2) = (a+b) (a -b)` `:. 81 x^(2) - 225y^(2)` `= (9x)^(2) - (15y)^(2)` `= (9x + 15y) (9x - 15y)` `:. 9x + 15y and 9x - 15y` are the factors of `81x^(2) - 225 y^(2)` |
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