Question

multiply:(-2)×(-5)×4×(-2)×(-1)​

Answer 1

Answer:

(-2)×(-5)=10

(-2)×(-1)=2

then 4×10×2= 80

Answer 2

Answer:

-2 x - 5 x - 2 x-1 x 4

=10 x2 x4

=80

Step-by-step explanation:

Main concept

Sign conversion

-a x - b= ab