true 0 4 radians decimal true

x f x 3^2 x * + 1 - ←

x g 1 - (x 0^* 2 (x 1^* + 0 (x 2^* + 1 (x 3^* + ←

i.e.

x f x g - 0 —

Coefficients of a vector for the polyroots function should be ordered by 'x' power from min value to max as shown into the defined above g(x) function.

roots 1 - 20141 mat polyroots ←

roots 0,4534 0,2267 - 1,4677 i * + 0,2267 - 1,4677 i * - 31 mat =

roots 1 el f 0 =

roots 1 el g 0 =

roots 2 el f 2,2204 1015 -^* - 1,9429 1015 -^* i * - =

roots 2 el g 2,2204 1015 -^* - 1,9429 1015 -^* i * - =

roots 3 el f 8,8818 1016 -^* 1,4433 1015 -^* i * + =

roots 3 el g 8,8818 1016 -^* 1,4433 1015 -^* i * + =

Note, the accuracy of polyroots function ia equal to the 10^(-15) that's why some answers are not zero, but those answers are very closed to zero.