RRB NTPC Mains or Stage 2 Model Paper 1 with solutions

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Question : 25 of 120

Marks: +1, -0

Simplify %

3x (x + 4) – x (x – 2)

$2x^2 + 14x$
$4x^2 – 14x$
$4x^2 + 14x$
$2x^2 – 14x$

Solution:

(1)

3x (x + 4) – x (x – 2)

=3x^2+12x-x^2+2x

=2x^2+14x

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