RRB Group-D Model Paper 17 with answers for online practice

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Question : 19 of 100

Marks: +1, -0

If 5

^{√x}

+ 12

^{√x}

= 13

^{√x}

, then x is equal to

25/4
4
9
16

Solution:

We know that 5, 12 and 13 are pythagoreas triplets
⇒

13^2= 12^2+ 5^2

Comparing this to the given equation,
⇒

√x

= 2
⇒ x = 4.

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