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Factorize `81x^(2) - 225 y^(2)`

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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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