RRB NTPC Mains or Stage 2 Model Paper 7 with solutions

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Question : 27 of 120

Marks: +1, -0

√{86.49 }+√ {5 + (?)^2} =12.3.

– 2
2
$√14$
$√ 2$

Solution:

(b) Let

√86.49 + √{5 + x^2} = 12.3.

Then,

9.3+ √{5+ x^2} = 12.3 ⇔ √{5+ x^2} = 12.3 –9.3 = 3

⇔ 5 + x^2 = 9 ⇔ x^2 = 9 – 5 = 4 ⇔ x =√ 4= 2.

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