Answer:
Let y be the double of x i.e. y = 2x By using on both sides \[{{y}^{3}}={{(2x)}^{3}}\] \[\Rightarrow \]\[{{y}^{3}}={{2}^{3}}\times {{x}^{3}}=2\times 2\times 2\times {{x}^{3~}}\] \[\Rightarrow \] \[{{y}^{3}}=8{{x}^{3}}\]
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