Q. Simplify the expression completely.−43729+43216+4−81−3729Answer:
Simplify Cube Roots: First, we will simplify each term separately, starting with the cube roots and then the square root of a negative number.−43729 simplifies to −4 times the cube root of 729.
Simplify Cube Roots: The cube root of 729 is 9 because 93=729. So, −43729 simplifies to −4×9, which is −36.
Simplify Cube Roots: Next, we simplify 43216, which is 4 times the cube root of 216. The cube root of 216 is 6 because 63=216. So, 43216 simplifies to 4×6, which is 24.
Simplify Square Root: Now, we simplify 4−81. The square root of −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, 4−81 is an imaginary number, 4i×9, since the square root of 81 is 9.
Combine Simplified Terms: Finally, we simplify −3729, which is the cube root of 729.As we found earlier, the cube root of 729 is 9.So, −3729 simplifies to −9.
Combine Real and Imaginary Terms: Now, we combine all the simplified terms.−36 (from the first term) + 24 (from the second term) + 4i×9 (from the third term) - 9 (from the fourth term).
Final Simplified Expression: Combining the real number terms gives us −36+24−9, which simplifies to −21. The imaginary term remains 4i×9, which is 36i.
Final Simplified Expression: Combining the real number terms gives us −36+24−9, which simplifies to −21. The imaginary term remains 4i×9, which is 36i.Since we cannot combine real numbers with imaginary numbers, the expression simplifies to −21+36i.