factorize this 9x^-16y^
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9x²-16y²
= (3x)²-(4y)²
= (3x+4y)(3x-4y) ( a²-b²=(a+b)(a-b))
= (3x)²-(4y)²
= (3x+4y)(3x-4y) ( a²-b²=(a+b)(a-b))
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