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Simplify the expression completely.

-4root(3)(729)+4root(3)(216)+4sqrt(-81)-root(3)(729)
Answer:

Simplify the expression completely.\newline47293+42163+4817293 -4 \sqrt[3]{729}+4 \sqrt[3]{216}+4 \sqrt{-81}-\sqrt[3]{729} \newlineAnswer:

Full solution

Q. Simplify the expression completely.\newline47293+42163+4817293 -4 \sqrt[3]{729}+4 \sqrt[3]{216}+4 \sqrt{-81}-\sqrt[3]{729} \newlineAnswer:
  1. Simplify Cube Roots: First, we will simplify each term separately, starting with the cube roots and then the square root of a negative number.\newline47293-4\sqrt[3]{729} simplifies to 4-4 times the cube root of 729729.
  2. Simplify Cube Roots: The cube root of 729729 is 99 because 93=7299^3 = 729. So, 47293-4\sqrt[3]{729} simplifies to 4×9-4 \times 9, which is 36-36.
  3. Simplify Cube Roots: Next, we simplify 421634\sqrt[3]{216}, which is 44 times the cube root of 216216. The cube root of 216216 is 66 because 63=2166^3 = 216. So, 421634\sqrt[3]{216} simplifies to 4×64 \times 6, which is 2424.
  4. Simplify Square Root: Now, we simplify 4814\sqrt{-81}. The square root of 81-81 is not a real number; it is an imaginary number because you cannot take the square root of a negative number in the set of real numbers. So, 4814\sqrt{-81} is an imaginary number, 4i×94i \times 9, since the square root of 8181 is 99.
  5. Combine Simplified Terms: Finally, we simplify 7293-\sqrt[3]{729}, which is the cube root of 729729.\newlineAs we found earlier, the cube root of 729729 is 99.\newlineSo, 7293-\sqrt[3]{729} simplifies to 9-9.
  6. Combine Real and Imaginary Terms: Now, we combine all the simplified terms.\newline36-36 (from the first term) + 2424 (from the second term) + 4i×94i \times 9 (from the third term) - 99 (from the fourth term).
  7. Final Simplified Expression: Combining the real number terms gives us 36+249-36 + 24 - 9, which simplifies to 21-21. The imaginary term remains 4i×94i \times 9, which is 36i36i.
  8. Final Simplified Expression: Combining the real number terms gives us 36+249-36 + 24 - 9, which simplifies to 21-21. The imaginary term remains 4i×94i \times 9, which is 36i36i.Since we cannot combine real numbers with imaginary numbers, the expression simplifies to 21+36i-21 + 36i.

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