A quadratic with real coefficients has as one root. Which quadratic is it, if the leading coefficient is ?
Answer and explanation
Correct answer: C.
- Step 1: Non-real roots come in conjugate pairs, so the roots are . Step 2. Sum and product , so . **Answer: . Why not the others:** 3+-2 are real numbers, not the roots; the sum of roots enters with a minus sign; the product is +13.
Practise more Calculus, Complex Numbers, Vectors and Probability.
Free questions with an explanation for every one, and full timed Wazari Exam (Iraq Baccalaureate) - Scientific Branch mock tests.