Question 45Asked in BPSC TRE 1.0 (2023) Mathematics Class 11-12

If (x + iy)^(1/3) = a + ib, then x/a + y/b is equal toयदि (x + iy)^(1/3) = a + ib, तो x/a + y/b बराबर है

यदि (x + iy)^(1/3) = a + ib, तो x/a + y/b बराबर है
  1. A4(a² − b²)4(a² − b²)
  2. Ba² − b²a² − b²
  3. Ca² + b²a² + b²
  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: (A) 4(a² − b²)4(a² − b²)

Explanation

Cubing, x + iy = (a + ib)³ = (a³ − 3ab²) + i(3a²b − b³). So x/a = a² − 3b² and y/b = 3a² − b², and their sum is 4a² − 4b² = 4(a² − b²).घन करने पर x + iy = (a + ib)³ = (a³ − 3ab²) + i(3a²b − b³)। अतः x/a = a² − 3b² और y/b = 3a² − b², और इनका योग 4a² − 4b² = 4(a² − b²) है।

From BPSC TRE 1.0 (2023) Mathematics Class 11-12 — Previous Year Paper

This is question 45 of BPSC TRE 1.0 (2023) Mathematics Class 11-12 — 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.