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0 votes
22.5k views
in Cubes And Cube Roots by (58.8k points)

Which of the following numbers is a perfect cube

a) 1152
b) 1331
c) 2016
d) 739

1 Answer

+1 vote
by (44.3k points)
selected by
 
Best answer

Firstly we have to find the factors for the above numbers

∛1152 = \(\sqrt[3]{(2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 × 3)}\) = 4\(\sqrt[3]{( 2 × 3 × 3)}\)

∛1331 = \(\sqrt[3]{(11 × 11 × 11)}\)

∛2016 = \(\sqrt[3]{(2 × 2 × 2 × 2 × 2 × 3 × 3 × 7)}\) = 2 \(\sqrt[3]{(2 × 2 × 3 × 3 × 7)}\)

∛739 = no prime factors can be found.

From the above results, 1331 has the perfect cube factors.

∴ 1331 is the perfect cube.

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