Two mark exercise problems X — task. Mathematics State Board, Class 9.

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Answer variants:

$(x^{2} + 4) (x + 2) (x - 2)$

${(x + 4)}^{2}$

${(3 a - 24 b)}^{2}$

$x (x^{2} + 4) (x + 2) (x - 2)$

${3 (a - 4 b)}^{2}$

${(x + 2)}^{2}$

Factorize the following:

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21. Two mark exercise problems X