Respuesta:
[tex]30x^3+29x^2+10x+1[/tex]
Explicación paso a paso:
[tex]\left(5x^2+4x+1\right)\left(6x+1\right)\\\\=5x^2\cdot \:6x+5x^2\cdot \:1+4x\cdot \:6x+4x\cdot \:1+1\cdot \:6x+1\cdot \:1\\\\=5\cdot \:6x^2x+5\cdot \:1\cdot \:x^2+4\cdot \:6xx+4\cdot \:1\cdot \:x+1\cdot \:6x+1\cdot \:1\\\\=30x^3+29x^2+10x+1[/tex]
