Respuesta :

Hi, there.

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Substitute 19 for t.

[tex]\boldsymbol{3(19)(19+2)-3(19)^2}[/tex]

Simplify.

[tex]\boldsymbol{57(21)-3(361)}[/tex]

Simplify.

[tex]\boldsymbol{1,197-1,083}[/tex]

Simplify.

[tex]\boldsymbol{114}[/tex]

Hope the answer - and explanation - made sense,

happy studying!!

Answer: 114.

Step-by-step explanation:

[tex]3t(t+2)-3t^2=\\3t*t+3t*2-3t^2=\\3t^2+6t-3t^2=\\6t.\\t=19\\6*19=\\114.[/tex]