RRB NTPC Mains or Stage 2 Model Paper 2 with solutions

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Question : 93 of 120

Marks: +1, -0

Simplify:

(3y)^2 + x^2 – (2y)^2

$x^2 + y^2$
$x^2 – y^2$
$x^2 – 5y^2$
$x^2 + 5y^2$

Solution:

(d) Simplify :

(3y)^2 + x^2 - (2y)^2

⇒9y^2 + x^2 - 4y^2

⇒5y^2 + x^2 or x^2 + 5y^2

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