Calculate the subtraction (8.5−1.8i)−(−1.3+2.7i) . Provide the answer in the form of a+bi .(4 points)
To subtract complex numbers, we subtract the real parts and the imaginary parts separately.
The real part of the expression is (8.5 - 1.8i) - (-1.3) = 8.5 - 1.8i + 1.3 = 9.8 - 1.8i.
The imaginary part of the expression is -1.8i - 2.7i = -4.5i.
Therefore, the subtraction (8.5 - 1.8i) - (-1.3 + 2.7i) is equal to 9.8 - 1.8i - 4.5i.
The final answer is 9.8 - 6.3i, in the form of a+bi.