Symbiosis National Aptitude Test SNAP 2014 Paper

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Question : 19 of 150

Marks: +1, -0

What number must be added to the expression

16a^2

– 12a to make it a perfect square?

9/4
11/2
13/2
16

Solution:

16a^2

– 12a =

(4a)^2

– 2(4a)(3/2)
∴ The number is

(3/2)^2

= (9/4).

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