how do i solve the following problems?

a^5+6a^4+5a^3=0

t^5-256t=0

y^3-512=0

z=8(root)z+240

2 answers

You have to factor to solve.
a^5 + 6a^4 + 5a^3 = 0
a^3(a + 1)(a + 5) = 0

a^3 = 0
a = 0

a + 1 = 0
a = -1

a + 5 = 0
a = -5

Do the other problems the same to solve.
i don't understand how to do them. ive tried getting help but i just don't understand them