3 x es un factor común
3 x² + 21 x = 3 x (x + 7) = 0
1) x = 0
2) x = - 7
Mateo
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3 x es un factor común
3 x² + 21 x = 3 x (x + 7) = 0
1) x = 0
2) x = - 7
Mateo