Factorise 9x^2-24xy+16y
^2
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9x^2 -12xy -12xy +16y^2 =0
3x(3x-4y) -4y(3x-4y) =0
(3x-4y)(3x-4y) =0
x= 4y/3 , 4y/3
hope it will help you
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