Question

Dada a função R → R, definida por: f ( x ) = 3x – 2 determine o valor de
f( − 1 ) – f ( 2 ) + f ( 1 ).

Answer 1

Resposta:

f ( x ) = 3x – 2 determine o valor de

f( − 1 ) – f ( 2 ) + f ( 1 )

3*(-1)-2 - (3*2-2) + 3*1+2 =

=-3 -2 -6 +2 +3 +2

=-3  -6  +3 +2

= -6   +2

= -4

Answer 2

Explicação passo-a-passo:

Basta substituir os valores entre parênteses no lugar do x e fazer as contas.

\begin{gathered}f(-1)=3*(-1)-2=-3-2=-5\\\\f(2)=3*2-2=6-2=4\\\\f(1)=3*1-2=3-2=1\\\\f(-1)-f(2)+f(1)=-5-4+1=-9+1=-8\end{gathered}

f(−1)=3∗(−1)−2=−3−2=−5

f(2)=3∗2−2=6−2=4

f(1)=3∗1−2=3−2=1

f(−1)−f(2)+f(1)=−5−4+1=−9+1=−8