GRE Sample Test 3 Quantitative Reasoning 2

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Question : 10 of 20

Marks: +1, -0

Which of the following must be even?

$x^2 + 6x + 9$
$x^2 + 7x + 12$
$x^2 + 4x - 21$
$x^2 + 4x - 12$
$x^2 + 8x + 15$

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