9xsquare +66xy +121ysquare
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Please mark me BRAINLIEST if this worked..
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Answer:
9x^2+66xy+121y^2
=> (3x)^2 + 2(3x)(11y) +(11y)^2
=> a^2 + 2ab+b^2
=> (a+b)^2
=>(3x+11y)^2
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