How are you? I am stuck on 4.25 and 4.29. For 4.25, I am completely stumped, but for 4.29, I tried turning the equation into 1+a+a^2+a^3+a^4+a^5-a-a^2-a^3, but when I continued from there, the equation only got more complicated. Please help me on 4.25 and 4.29, and thank you!