Expand and simplify the following: (-2y+4)(5y+5)

First, distribute the terms:

(-2y) * (5y) + (-2y) * (5) + (4) * (5y) + (4) * (5)

Now, simplify each term:

-10y^2 - 10y + 20y + 20

Combine like terms:

-10y^2 + 10y + 20