a) Express (z^5 - 1) as a product of two factors, one of which is linear

b) Find the zeroes of (z^5 - 1) giving your answers in the form r(cos *theta* + i sin *theta*) where r > 0 and -pi < *theta* < pi.

c) Express z^4 + z^3 + z^2 + z + 1 as a product of two real quadratic factors

Thanks in advance!