Question

Find 2 cube number that is greater then 20 but less than 50

Answer 1

`20\leqslant x {}^(3) \leqslant 50`

`\sqrt[3]{20} \leqslant x \leqslant \sqrt[3]{50}`

`2.714 \leqslant x \leqslant 3.684`

`x = 3`

`x = 3.5`

verify your answer:

`3 {}^( 3) = 27`

`20\leqslant27 \leqslant 50`

`3.5 {}^(3) = 42.875`

`20 \leqslant 42.875 \leqslant 50`