SSC CHSL 15 Nov 2015 Shift 2 Paper

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Question : 135 of 200

Marks: +1, -0

If

a/b+b/a=2

, then the value of a-b is:

2
-1
0
1

Solution:

Given :

a/b+b/a=2

⇒

{a^2+b^2}/{ab}=2

⇒

a ^2 + b^ 2 = 2ab

⇒

a^ 2 + b ^2 − 2ab = 0

⇒

(a − b)^2 = 0

⇒

a − b = 0

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