SSC CPO SI and ASI 2014 Paper

Question : 131 of 200

Marks: +1, -0

An example of an equality relation of two expressions in x, which is not an identity is

Solution:

(3) As

(a+b) ^2=a^{2}+b^{2}+2 a b,

(x+ 2 )^{2}=x^{2}+2 × x × 2+2^{2}

=x^{2}+4 x+4

Therefore,

(x+2)^{2}=x^{2}+4 x+4

is not an identity.

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