Multiply and simplify the following complex numb $(-4-5 i) \cdot(1-i)$ Stuck? Review related articles/videos or use a hint.

Step 1 ：Multiply the two complex numbers (-4-5i) and (1-i) similar to the multiplication of binomials.

Step 2 ：Remember that i^2 = -1.

Step 3 ：The multiplication results in a complex number -9 - i.

Step 4 ：\(\boxed{-9 - i}\) is the final answer.