Cube Roots Math Example 2

Follow the full solution, then compare it with the other examples linked below.

Example 2

medium
Simplify 543\sqrt[3]{54}.

Solution

  1. 1
    Factor 5454 to expose a perfect cube: 54=27ร—2=33ร—254 = 27 \times 2 = 3^3 \times 2.
  2. 2
    Split the cube root across the product: 543=33ร—23=333ร—23\sqrt[3]{54} = \sqrt[3]{3^3 \times 2} = \sqrt[3]{3^3} \times \sqrt[3]{2}.
  3. 3
    Take the cube root of the perfect cube: 333=3\sqrt[3]{3^3} = 3, so the simplified form is 3233\sqrt[3]{2}.

Answer

3233\sqrt[3]{2}
To simplify a cube root, factor out perfect cubes. The cube root distributes over multiplication: ab3=a3โ‹…b3\sqrt[3]{ab} = \sqrt[3]{a} \cdot \sqrt[3]{b}.

About Cube Roots

The cube root x3\sqrt[3]{x} is the number that, when cubed, gives xx โ€” defined for all real numbers, including negatives.

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