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Answer:
(3x-11y) (3x-11y)
Step-by-step explanation:
9x ^2 - 66xy+121y^2
9x^2-33xy -33xy +121y^2
3x(3x - 11y) - 11y(3x- 11y)
( 3x- lly) (3x-11y)
Rough work :
9× 121 = 1089
3 ×363 =1089
11 ×99 =1089
33×33 =1089
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