Q175 · Practice questionTechnology-freeComplex familiar1 mark
QUESTION 175
The polynomial has zero . Which is its other zero?
(A)
(B)
(C)
(D)
WORKED SOLUTION
1 markAnswer C
ANSWER
C.
Worked solution
The sum of the zeros is , so the other is . Indeed . The coefficients are not all real, so the conjugate-root theorem does not require to be a zero.
Equivalent mathematically justified methods accepted.
Exact answers unless a decimal accuracy is specified.
Select C.
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
View the QCAA syllabus