Question 74Asked in BPSC TRE 1.0 (2023) Mathematics Class 9-10

The factors of 2a⁷ − 128a are2a⁷ − 128a के गुणनखण्ड हैं

2a⁷ − 128a के गुणनखण्ड हैं
  1. Aa(a + 2)³(a − 2)³a(a + 2)³(a − 2)³
  2. B2a(a + 2)(a − 2)(a² + 2a − 4)(a² − 2a − 4)2a(a + 2)(a − 2)(a² + 2a − 4)(a² − 2a − 4)
  3. C2a(a + 2)(a − 2)(a² + 2a + 4)(a² − 2a + 4)2a(a + 2)(a − 2)(a² + 2a + 4)(a² − 2a + 4)
  4. DMore than one of the aboveउपर्युक्त में से एक से अधिक
  5. ENone of the aboveउपर्युक्त में से कोई नहीं
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Correct answer: (C) 2a(a + 2)(a − 2)(a² + 2a + 4)(a² − 2a + 4)2a(a + 2)(a − 2)(a² + 2a + 4)(a² − 2a + 4)

Explanation

2a⁷ − 128a = 2a(a⁶ − 64) = 2a(a³ − 8)(a³ + 8) = 2a(a − 2)(a² + 2a + 4)(a + 2)(a² − 2a + 4).2a⁷ − 128a = 2a(a⁶ − 64) = 2a(a³ − 8)(a³ + 8) = 2a(a − 2)(a² + 2a + 4)(a + 2)(a² − 2a + 4)।

From BPSC TRE 1.0 (2023) Mathematics Class 9-10 — Previous Year Paper

This is question 74 of BPSC TRE 1.0 (2023) Mathematics Class 9-10 — Previous Year Paper. 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.