A quadratic equation with real coefficients has one root $$. State the other root.
Answer and explanation
Correct answer: B.
- Step 1: Complex roots of a polynomial with real coefficients occur in conjugate pairs. Step 2. The other root is . **Answer: . Why not the others:** : The real part has the wrong sign. : Both parts have the wrong sign. : The real and imaginary parts are swapped.
Practise more Complex numbers.
Free questions with an explanation for every one, and full timed Singapore GCE A-Level mock tests.