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RPF SI Polynomials — practice questions

Explore 1 free Polynomials questions in RPF SI Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.

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If a, b and c are the zeros of the cubic polynomial 2x^3 - x^2 - 2x + 1, find the value of ab + bc + ca.Read the answer and worked solution →

Worked practice questions

If a, b and c are the zeros of the cubic polynomial 2x^3 - x^2 - 2x + 1, find the value of ab + bc + ca.

  1. 2
  2. -1
  3. 0
  4. +1
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Correct answer: B. -1

1. For ax^3 + bx^2 + cx + d, the sum of products of zeros taken two at a time = c/a. 2. Here c = -2 and a = 2. 3. So ab + bc + ca = -2 / 2 = -1. _Source: RRB Group D CEN-02/2018 PYQ, Q.84._

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