Let's simplify the given expression:
(5m - 1)*(m + 1) - 5m8(m + 2)
First, let's expand the terms inside the parentheses:
= (5m^2 + 5m - m - 1) - 40m - 80
Now, let's combine like terms:
= 5m^2 + 4m - 1 - 40m - 80
= 5m^2 - 36m - 81
Therefore, (5m - 1)*(m + 1) - 5m8(m + 2) simplifies to 5m^2 - 36m - 81.
Let's simplify the given expression:
(5m - 1)*(m + 1) - 5m8(m + 2)
First, let's expand the terms inside the parentheses:
= (5m^2 + 5m - m - 1) - 40m - 80
Now, let's combine like terms:
= 5m^2 + 4m - 1 - 40m - 80
= 5m^2 - 36m - 81
Therefore, (5m - 1)*(m + 1) - 5m8(m + 2) simplifies to 5m^2 - 36m - 81.