The teacher will be very surprised to see your correct solution 😉
x1 = 1
/ ___ ___ 4 ___\ ___ 4 ___ 1 | \/ 3 \/ 2 *\/ 3 | \/ 2 *\/ 3 x2 = - - + I*|- ----- - -----------| - ----------- 2 \ 2 2 / 2
/ ___ ___ 4 ___\ ___ 4 ___ 1 |\/ 3 \/ 2 *\/ 3 | \/ 2 *\/ 3 x3 = - - + I*|----- - -----------| + ----------- 2 \ 2 2 / 2
/ ___ ___ 4 ___\ ___ 4 ___ 1 | \/ 3 \/ 2 *\/ 3 | \/ 2 *\/ 3 x4 = - - + I*|- ----- + -----------| + ----------- 2 \ 2 2 / 2
/ ___ ___ 4 ___\ ___ 4 ___ 1 |\/ 3 \/ 2 *\/ 3 | \/ 2 *\/ 3 x5 = - - + I*|----- + -----------| - ----------- 2 \ 2 2 / 2
x5 = -sqrt(2)*3^(1/4)/2 - 1/2 + i*(sqrt(3)/2 + sqrt(2)*3^(1/4)/2)
sum
/ ___ ___ 4 ___\ ___ 4 ___ / ___ ___ 4 ___\ ___ 4 ___ / ___ ___ 4 ___\ ___ 4 ___ / ___ ___ 4 ___\ ___ 4 ___ 1 | \/ 3 \/ 2 *\/ 3 | \/ 2 *\/ 3 1 |\/ 3 \/ 2 *\/ 3 | \/ 2 *\/ 3 1 | \/ 3 \/ 2 *\/ 3 | \/ 2 *\/ 3 1 |\/ 3 \/ 2 *\/ 3 | \/ 2 *\/ 3 1 + - - + I*|- ----- - -----------| - ----------- + - - + I*|----- - -----------| + ----------- + - - + I*|- ----- + -----------| + ----------- + - - + I*|----- + -----------| - ----------- 2 \ 2 2 / 2 2 \ 2 2 / 2 2 \ 2 2 / 2 2 \ 2 2 / 2
=
/ ___ ___ 4 ___\ / ___ ___ 4 ___\ / ___ ___ 4 ___\ / ___ ___ 4 ___\ |\/ 3 \/ 2 *\/ 3 | |\/ 3 \/ 2 *\/ 3 | | \/ 3 \/ 2 *\/ 3 | | \/ 3 \/ 2 *\/ 3 | -1 + I*|----- + -----------| + I*|----- - -----------| + I*|- ----- + -----------| + I*|- ----- - -----------| \ 2 2 / \ 2 2 / \ 2 2 / \ 2 2 /
product
/ / ___ ___ 4 ___\ ___ 4 ___\ / / ___ ___ 4 ___\ ___ 4 ___\ / / ___ ___ 4 ___\ ___ 4 ___\ / / ___ ___ 4 ___\ ___ 4 ___\ | 1 | \/ 3 \/ 2 *\/ 3 | \/ 2 *\/ 3 | | 1 |\/ 3 \/ 2 *\/ 3 | \/ 2 *\/ 3 | | 1 | \/ 3 \/ 2 *\/ 3 | \/ 2 *\/ 3 | | 1 |\/ 3 \/ 2 *\/ 3 | \/ 2 *\/ 3 | |- - + I*|- ----- - -----------| - -----------|*|- - + I*|----- - -----------| + -----------|*|- - + I*|- ----- + -----------| + -----------|*|- - + I*|----- + -----------| - -----------| \ 2 \ 2 2 / 2 / \ 2 \ 2 2 / 2 / \ 2 \ 2 2 / 2 / \ 2 \ 2 2 / 2 /
=
1
1
x1 = 0.4306048591021 - 0.0645794553176609*i
x2 = -1.4306048591021 + 1.79663026288654*i
x3 = 1.0
x4 = -1.4306048591021 - 1.79663026288654*i
x5 = 0.4306048591021 + 0.0645794553176609*i
x5 = 0.4306048591021 + 0.0645794553176609*i