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    • Question

      If p = 25 - q - r and pq + r(p + q) = 256, then find the

      value of (p² + q² + r²).
      A 113 Correct Answer Incorrect Answer
      B 125 Correct Answer Incorrect Answer
      C 136 Correct Answer Incorrect Answer
      D 108 Correct Answer Incorrect Answer

      Solution

      We have, p = 25 - q - r
      So, p + q + r = 25
      And, pq + r(p + q) = 256
      Or, pq + qr + pr = 256
      Using, (p + q + r)² = p² + q² + r² + 2(pq + qr + pr)
      25² = (p² + q² + r²) + 2 × 256
      625 = (p² + q² + r²) + 512
      p² + q² + r² = 113

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