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solve by factor , the positive square root of 21904

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21904
= 2 x 10952
= 2 x 2 x 5476
= 2 x 2 x 2 x 2738
= 2 x 2 x 2 x 2 x 1369
= 2 x 2 x 2 x 2 x 37 x 37
= (2 x 2 x 37) x (2 x 2 x 37)
= 148 x 148