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Which expression is a perfect cube?
-8x^21y^8
-64x^64y^64
-125x^9y^20
-216x^9y^18
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1 Answer

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[tex]-216x^9y^{18}[/tex]

Step-by-step explanation:

[tex]~~-216 x^9 y^{18}\\\\=(-6)^3 (x^3)^3 (y^6)^3\\\\=(-6x^3 y^6)^3[/tex]
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