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= 3x.(1+5x)
=3x + 15x2 (elevado al cuadrado)
2. 3x.(1+x)
=3x+3x.x
=3x+3x2 (elevado al cuadrado)
3. -5x.(x-x+2)
=-5x.2
=-10x
Espero poderte ayudado:)