Start learning →

IPPB (India Post Payments Bank) Algebraic Identities — practice questions

Explore 1 free Algebraic Identities questions in IPPB (India Post Payments Bank) Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.

Practise Algebraic Identities with Quill →

Algebraic Identities questions and exercises with answers

Showing questions 1–1 of 1.

If a is positive and a² + 1/a² = 7, then a³ + 1/a³ equals:Read the answer and worked solution →

Worked practice questions

If a is positive and a² + 1/a² = 7, then a³ + 1/a³ equals:

  1. 21
  2. 3√7
  3. 18
  4. 7√7
Show answer and solution

Correct answer: C. 18

1. (a + 1/a)² = a² + 1/a² + 2 = 7 + 2 = 9, so a + 1/a = 3. 2. a³ + 1/a³ = (a + 1/a)³ − 3(a + 1/a). 3. = 27 − 9 = 18. _Source: RRB Group D CEN-02/2018 PYQ, Q.39._

Open this question →

How to practise

  1. Choose a Algebraic Identities question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

More Quantitative Aptitude topics

MensurationMultiplicationNumber PropertiesSimple InterestSquares And RootsPercentagesNumber SystemRatio and Proportion