Expand (-4a^2 - 3b)(-6a+5b^2)

Using the distributive property, we can expand this expression as:

-4a^2(-6a) - 4a^2(5b^2) - 3b(-6a) - 3b(5b^2)

Simplifying each term, we get:

24a^3 - 20a^2b^2 - 18ab + 15b^3

So the final expanded form is:

24a^3 - 20a^2b^2 - 18ab + 15b^3.