• Matéria: Matemática
  • Autor: antunesana20199
  • Perguntado 5 anos atrás

help!
( {3x}^{2} - 4x - 3).(x + 1) =

Respostas

respondido por: Nasgovaskov
1

> Faça a distributiva, multiplique o termo de um parênteses pelo termo do outro parênteses

> Depois da multiplicação reduza os termos semelhantes, somando ou subtraindo os coeficientes de termos iguais

Obs.: quando se multiplica letras iguais, some seus expoentes

\underbrace{Veja:}

\Rightarrow~~\sf (3x^2-4x-3)\cdot(x+1)

\Rightarrow~~\sf 3x^2\cdot x+3x^2\cdot1+(-4x)\cdot x+(-4x)\cdot1+(-3)\cdot x+(-3)\cdot1

\Rightarrow~~\sf 3x^3+3x^2-4x^2-4x-3x-3

\Rightarrow~~\sf 3x^3+(3x^2-4x^2)+(-4x-3x)-3

\Rightarrow~~\sf 3x^3+(3-4)x^2+(-4-3)x-3

\therefore~~\boxed{\sf 3x^3-x^2-7x-3}

Anexos:

Nasgovaskov: \underline{\overline{\large\begin{array}{||c||c||c||c||}\sf-10&\sf3&\sf 9&\sf-81\end{array}}}\\ \underline{\large\begin{array}{||c||c||c||c||}\sf~~12~~&\sf~~16~~&\sf~~-14~~~&\sf~~~10~~\end{array}}\\ \underline{\large\begin{array}{||c||c||c||c||}\sf~~~~4~~~~&\sf~~~81~~~&\sf~~~-4~~~~&\sf -9\end{array}}\\ \underline{\large\begin{array}{||c||c||c||c||}\sf~~~-3~~~&\sf~-12~~&\sf~~-16~~~~&\sf~~14~\end{array}}
Anônimo: \underline{\overline{\large\begin{array}{|c|c|c|c|}\sf\ -\!10~~~\:\!\:\!\:\! &\sf~~~\ \,\:\!3~~~~\,&\sf~~~~9~~~~\:\!&\sf~-\!81~~\end{array}}}\\ \underline{\large\begin{array}{|c|c|c|c|}\sf~~~~ 12~~\ \:\:\! &\sf~~~\,\:\!16~~\ \:\:\!&\sf~-\!14~~\,&\sf~~~10~~~\end{array}}\\
Anônimo: \underline{\large\begin{array}{|c|c|c|c|}\sf~~~~\:\:\!4~~~~\,&\sf~~~\:\:\!81~~~\:&\sf~\,-\!4~~~\,&\sf~-\!9~~~\end{array}}\\ \underline{\large\begin{array}{|c|c|c|c|}\sf~~-\!3~~~~\:\!&\sf~\:\!-\!12~~~\:\!&\sf~-\!16~~\,&\sf~~\ 14~\end{array}}
Anônimo: Mandei em duas partes pq não deu pra mandar tudo
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