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