PYQ - Find the missing term in the polynomial — task. Maths TNSB Mentoring, Class 10 Crash course.

Which of the following should be added to make \(x^4 + 9\) a perfect square?

$6 x^{2}$
$9 x^{2}$
$3 x^{2}$
$- 3 x^{2}$

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