Final answer:
To simplify the expression -2i * (-3i), we multiply the numbers together using the property that i^2 is equal to -1. The result is -6.
Step-by-step explanation:
To simplify the expression -2i * (-3i), we need to multiply the two complex numbers together. When multiplying two imaginary numbers, we can use the property that i^2 is equal to -1. Applying this property, we have:
-2i * (-3i) = -2 * (-3) * i * i = 6 * i^2 = 6 * (-1) = -6
Therefore, the simplified expression is -6, so the correct option is d) -6.