factorise x³-18x²y+81xy²
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Answer:
(x-9y)(x²-9xy)
Step-by-step explanation:
x³-18x²y+81xy²
= x³-(9+9)x²y+81xy²
= x³-9x²y-9x²y+81xy²
= x²(x-9y)-9xy(x-9y)
= (x-9y)(x²-9xy)
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