Mathematics, 08.07.2019 01:40 jfitness11
Which expression is a perfect cube? a. -8x21y8 b. -64x64y64 c. -125x9y20 d. -216x9y18
Answers: 2
![\sqrt[3]{-8x^{21}y^{8}}](/tpl/images/0063/8457/03fdb.png)
![\sqrt[3]{-8}](/tpl/images/0063/8457/62d58.png)
 ![\sqrt[3]{x^{21}<img src=](/tpl/images/0063/8457/a6ddf.png)
} " alt=" \sqrt[3]{y^8}" />} " />Â 
is not a perfect cube, therefore expression A is not a perfect cube.![\sqrt[3]{-64x^{64}y^{64}}](/tpl/images/0063/8457/5167c.png)
![\sqrt[3]{-64} \sqrt[3]{x^{64}} \sqrt[3]{y^{64}}](/tpl/images/0063/8457/c20f2.png)
and 
are not perfect cube because 64/3 doesn't give whole number![\sqrt[3] {-125x^9y^{20}}](/tpl/images/0063/8457/dd30f.png)
![\sqrt[3]{-125} \sqrt[3]{x^9} \sqrt[3] {y^{20}}](/tpl/images/0063/8457/92045.png)
are not perfect cube because 20/3 doesn't give whole number![\sqrt[3]{ -216 x^{9} y^{18} }](/tpl/images/0063/8457/520f5.png)
![\sqrt[3]{-216} \sqrt[3]{x^9} \sqrt[3]{y^{18}}](/tpl/images/0063/8457/d7e49.png)
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Which expression is a perfect cube? a. -8x21y8 b. -64x64y64 c. -125x9y20 d. -216x9y18...
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