[tex]a. \: \sqrt[3]{ - 40} = \sqrt[3]{( -8) \times 5} = \sqrt[3]{ {( - 2)}^{3} \times 5 } = - 2\sqrt[3]{5} \\ [/tex]
[tex]b. \: \sqrt[3]{100} = \sqrt[3]{( - 8) \times ( - 12.5)} = \sqrt[3]{ {( - 2)}^{3} \times ( - 12.5)} = - 2 \sqrt[3]{ - 12.5} \\ [/tex]
[tex]c. \: \sqrt[3]{2.4} = \sqrt[3]{( - 8) \times ( - 0.3)} = \sqrt[3]{ {( - 2)}^{3} \times ( - 0.3) } = - 2 \sqrt[3]{ - 0.3} \\ [/tex]
