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  9. Q21

BPSC (Bihar PCS) 2019 · Question 21 of 148

If x2 – y2 = 7 and x – y = 1, then the length of a diagonal of a rectangle with length and width respectively x cm and y cm will be

Miscellaneous

  1. A5 cmCorrect
  2. B6 cm
  3. C7 cm
  4. D8 cm
  5. ENone of the above/More than one of the above

Answer: A. 5 cm

Explanation

x+y = (x^2-y^2)/(x-y) = 7; diagonal = sqrt(x^2+y^2)... per key option D.

Source: Jagranjosh

← Q20View full paper (148 questions)Q22 →

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