Hi , I don't know what's going on here with the sigma notation (attached question and answer) .
A simplified explanation would be greatly appreciated .
Hi , I don't know what's going on here with the sigma notation (attached question and answer) .
A simplified explanation would be greatly appreciated .
The cubic is $\displaystyle z^3-2z^2+0z+k=0$
The sum of the roots; $\displaystyle \alpha+\beta+\gamma=2$
The product of roots two at a time: $\displaystyle \alpha\beta+\alpha\gamma+\beta\gamma=0$
The products of the roots: $\displaystyle \alpha\beta\gamma=-k$