Factorise: x³y³-9x²y²+20xy – InterviewSolution

1.	Factorise: x³y³-9x²y²+20xy
Answer» -step explanation: x³y³- 9x²y²+20xy= XY( x²y² - 9 xy + 20 )= xy( x²y² - 5XY - 4xy + 20 )= xy{ xy( xy - 5 ) - 4( xy - 5 ) }= xy{ ( xy - 5) ( xy - 4) }= xy( xy - 5 ) ( xy - 4 )

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