Identify cube roots: Identify the cube roots to be multiplied.We have two cube roots: the cube root of −54 and the cube root of 21. We need to multiply these two cube roots together.
Simplify cube root of −54: Simplify the cube root of −54. The cube root of −54 can be simplified by finding a perfect cube that is a factor of 54. We know that 27 is a perfect cube (33) and is a factor of 54. So we can write −54 as −27×2. The cube root of −27 is −540, because −541.
Simplify cube root of 21: Simplify the cube root of 21. The cube root of 21 cannot be simplified further because 21 is already in its simplest form. However, we can express it as the cube root of 1 divided by the cube root of 2.
Multiply simplified cube roots: Multiply the simplified cube roots.Now we multiply the cube roots we found in Step 2 and Step 3. So we have (−3)×(cube root of 21).
Calculate final answer: Calculate the final answer.Multiplying −3 by the cube root of 21 gives us −3×(21)31. This is the final simplified form of the expression.
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