Q3 · 2025 · Technology-activeSimple familiar1 mark
QUESTION 3
If all roots of the equation are plotted on an Argand plane and then joined by straight lines, the shape formed is
(A)
a right-angled triangle.
(B)
an equilateral triangle.
(C)
an isosceles triangle.
(D)
a scalene triangle.
WORKED SOLUTION
1 markAnswer B
ANSWER
B — an equilateral triangle
Worked solution
The roots are , and . They lie on the unit circle at equal angular intervals of , so their pairwise distances are equal.
Selects option B.
Worked explanation by QCE Vault; correct option verified against the QCAA answer key.
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