Monday 26 December 2016

Question of the day 25-12-2016

Question of the day:

If a - b = 3 and a2 + b2 = 99, find the value of ab?



a)45              b)40           c)90          d)None

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3 comments:

  1. Bhaskar Reddy28 December 2016 at 02:14

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    1. Bhaskar Reddy28 December 2016 at 02:15

      Answer: Option d
      Explanation:
      2ab = (a2 + b2) - (a - b)2
      = 29 - 9 = 20
      ab = 10.

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    2. Bhaskar Reddy28 December 2016 at 02:16

      Answer: Option d
      Explanation:
      2ab = (a2 + b2) - (a - b)2
      = 29 - 9 = 20
      ab = 10.

      Delete

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