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Question 82Asked in RRB JE CBT-1, 16 Dec 2024, Shift 1 (9:00 AM)

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

  1. A16a² + 81b² + 25c² + 76ab + 90bc + 40ac
  2. B16a² + 81b² + 25c² + 72ab + 90bc + 40ac
  3. C16a² + 81b² + 25c² + 72ab + 90bc + 50ac
  4. D16a² + 81b² + 25c² + 72ab + 85bc + 40ac
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Correct answer: (B) 16a² + 81b² + 25c² + 72ab + 90bc + 40ac

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

This is question 82 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.