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Oscar Hierro · Answer 1 · 2016-03-01T15:34:32+0000

5x³ + 30x² + 15x

Take out a common factor of 5x : 5x (x² + 6x + 3)

The factors of the quadratic portion are [ x - (-3 + √6) ] and [ x - (-3 - √6) ].

So finally, we wind up with:

5x (x + 3 - √6) (x + 3 + √6) .

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