81 by x square - 144 by y square
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(9 / x)^2 - (12 / y)^2
(9/x + 12/y) (9/x - 12/y)
(9/x + 12/y) (9/x - 12/y)
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Answer: 81x^2 -144y^2=0
We use the formula (a^2 -b^2) = (a-b) (a+b)
=(9x-12y) (9x+12y)
Step-by-step explanation:
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