Jawaban:

Salah satu akar persamaan begin mathsize 14px style x cubed plus a x squared minus left parenthesis 2 a plus 1 right parenthesis x minus 3 a equals 0 space end styleadalah undefined.

Sisa pembagian:

begin mathsize 14px style 6 minus 3 a equals 0 left right double arrow negative 3 a equals negative 6 left right double arrow a equals 2 end style

Hasil bagi:

begin mathsize 14px style x squared plus open parentheses a plus 2 close parentheses x plus 3 equals x squared plus 4 x plus 3 end style

Polinomial:

begin mathsize 14px style x cubed plus 2 x minus 5 x minus 6 equals left parenthesis x minus 2 right parenthesis left parenthesis x squared plus 4 x plus 3 right parenthesis equals left parenthesis x minus 2 right parenthesis left parenthesis x plus 3 right parenthesis left parenthesis x plus 1 right parenthesis end style

Maka hasil kali akar yang lain adalah begin mathsize 14px style negative 3 cross times negative 1 equals 3 end style.

Jadi, jawaban yang paling tepat adalah C.