[tex]\left(5x^3+10x^2+7x\right)+\left(x+1\right)[/tex]
Quitamos los paréntesis
[tex]=5x^3+10x^2+7x+x+1[/tex]
Sumamos los elementos similares
[tex]7x+x=8x[/tex]
[tex]\boxed{=5x^3+10x^2+8x+1}[/tex]
MUCHA SUERTE...
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RESOLVER:
[tex]\left(5x^3+10x^2+7x\right)+\left(x+1\right)[/tex]
Quitamos los paréntesis
[tex]=5x^3+10x^2+7x+x+1[/tex]
Sumamos los elementos similares
[tex]7x+x=8x[/tex]
[tex]\boxed{=5x^3+10x^2+8x+1}[/tex]
MUCHA SUERTE...