Question 230144
Your polynomial is 4-5b.


If you multiply this polynomial by (-1) * (-1) it will remain the same because (-1)^2 = 1


your expression becomes:


(-1) * (-1) * (4-5b).


If you multiply (-1) * (4-5b) you get (-4+5b) which is the same as (5b-4)


your expression becomes:


(-1) * (5b-4)


You have just factored out (-1) from your polynomial expression of (4-5b)