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  9. Q23

RRB Junior Engineer / DMS / CMA 2015 · Question 23 of 480

One of the factors of (81x2 -1) + (1 + 9x)2 is

Mathematics - Algebra

  1. Aa. 1 8xCorrect
  2. Bb. 9 + x
  3. Cc. 9-x
  4. Dd. 9x-1

Answer: A. a. 1 8x

Explanation

(81x2 -1) + (1 + 9x)2 = 81x2 -1 + 1 + 81x2 + 18x = 162x2 + 18x = 18x (9x + 1) .-.18x is factor of given polynomial

Source: Arihant RRB JE Solved Paper 26-Aug-2015 (3rd Shift), Q91–150 — published solved-paper compilation (Q1–90 technical not included in this source) · memory-based

← Q22View full paper (480 questions)Q24 →

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