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What will come in place of question mark in each of the following questions.   `sqrt(86.49) + sqrt(5 + (?)^2) = 12.3`


Options:
A .  1.2
B .  2
C .  2.5
D .  3
Answer: Option B

Sol.   `sqrt(86.49) + sqrt(5 + x^2) = 12.3`

         Then ,` 9.3 + sqrt(5 + x^2) = 12.3`   

         `hArr      sqrt(5 + x^2) = 12.3 - 9.3`

         `hArr       sqrt(5 + x^2) = 3`

          `hArr       5 + x^2 = 9`

           `hArr       x^2 = 9 - 5 = 4`

            `hArr        x^2 = 4`

             `hArr       x = sqrt(4)`

           `hArr          x = 2`




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