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  • Question
  • If ? 2 = 1.4142, then the value of 7 / (4 + ? 2) is?


  • Options
  • A. 3.5858
  • B. 4.4142
  • C. 1.2929
  • D. 1.5858

  • Correct Answer
  • 1.2929 

    Explanation

    ?7 / (4 + ?2) = [7 / (4 + ?2)] x [(4 - ?2 ) / (4 - ?2]
    = 7(4 - ?2) / (16 - 2)
    [? (a + b)(a - b) = a2 - b2]
    = 7(4 - ?2 )/14
    = (4 - ?2)/2
    = (4 - 1.4142)/2
    = 2.5858/2 = 1.2929


  • More questions

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      The median for the data 2, 4, 6, 8, 10, 12, 14 is

    • Options
    • A. 6
    • B. 8
    • C. 9.5
    • D. 10
    • Discuss
    • 2. 
      The value of 47 / 10000 is?

    • Options
    • A. .0047
    • B. .0470
    • C. .00047
    • D. .000047
    • Discuss
    • 3. If 4x = 18y, then the value of ( x/y - 1) is

    • Options
    • A. 1 3
    • B. 7 2
    • C. 2 3
    • D. 3 2
    • Discuss
    • 4. 
      If the price of 23 toys is Rs. 276, then what will the price (Rs.) of 12 toys?

    • Options
    • A. 144
    • B. 158
    • C. 159
    • D. 166
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    • 5. 
      .02 =(......?.....)%

    • Options
    • A. 20
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    • 6. 
      If 36 men can do a piece of work in 25 hours, in how many hours will 15 men do it?

    • Options
    • A. 45
    • B. 55
    • C. 60
    • D. 72
    • Discuss
    • 7. 
      2?63 / 11 =233

    • Options
    • A. 4
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    • D. 5
    • Discuss
    • 8. 
      When 121012 is divided by 12, the remainder is

    • Options
    • A. 0
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    • 9. 
      Aarti can do a piece of work in 6 days. In how many days will she complete three time of work of same type?

    • Options
    • A. 18 days
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    • Discuss
    • 10. 
      750.0003 ÷ 19.999 =?

    • Options
    • A. 49
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    • C. 22
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