x = (sqrt(3) (-2 - 12 sqrt(2) - i 2^(3/4)))/(2 (9 + sqrt(2)))
x = (i sqrt(3) (2 i + 12 i sqrt(2) + 2^(3/4)))/(2 (9 + sqrt(2)))
次の人↓
x(5x+3)=23x
x = (sqrt(3) (-2 - 12 sqrt(2) - i 2^(3/4)))/(2 (9 + sqrt(2)))
x = (i sqrt(3) (2 i + 12 i sqrt(2) + 2^(3/4)))/(2 (9 + sqrt(2)))
次の人↓
x(5x+3)=23x