Subtract (5 - 2i) - (1 + 8i). Which property allows you to write the expression as 5 - 2i - 1 - 8i?

This is the concept of algebra, we are required to subtract the complex numbers. Thus;

(5-2i) - 1 (1+8i)

opening the brackets using the distributive property we get:

5-2i-1-8i

collecting the like terms we get:

5-1-2i-8i

=4-10i

the answer will therefore be:

4-10i