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Question 9Asked in RRB JE CBT-1, 16 Dec 2024, Shift 1 (9:00 AM)

Write the expanded form of (9a + 4b + 5c)².

  1. A81a² + 16b² + 25c² + 72ab + 35bc + 90ac
  2. B81a² + 16b² + 25c² + 72ab + 40bc + 100ac
  3. C81a² + 16b² + 25c² + 72ab + 40bc + 90ac
  4. D81a² + 16b² + 25c² + 76ab + 40bc + 90ac
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Correct answer: (C) 81a² + 16b² + 25c² + 72ab + 40bc + 90ac

From RRB JE CBT-1 PYQ 16 Dec 2024, Shift 1 (9:00 AM)

This is question 9 of RRB JE CBT-1 PYQ 16 Dec 2024, Shift 1 (9:00 AM). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.