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Determine o valor numérico da função afim [tex]\( f(x) = -3x + 4 \)[/tex] para:

a) [tex]\( x = 1 \)[/tex]
b) [tex]\( x = \frac{1}{2} \)[/tex]
c) [tex]\( x = 0 \)[/tex]
d) [tex]\( x = k + 1 \)[/tex]

Sagot :

Claro! Vamos determinar o valor numérico da função afim [tex]\( f(x) = -3x + 4 \)[/tex] para os valores específicos de [tex]\( x \)[/tex].

### a) [tex]\( x = 1 \)[/tex]
Substituímos [tex]\( x \)[/tex] por 1 na função:
[tex]\[ f(1) = -3(1) + 4 \][/tex]
[tex]\[ f(1) = -3 + 4 \][/tex]
[tex]\[ f(1) = 1 \][/tex]

### b) [tex]\( x = \frac{1}{2} \)[/tex]
Substituímos [tex]\( x \)[/tex] por [tex]\( \frac{1}{2} \)[/tex] na função:
[tex]\[ f\left(\frac{1}{2}\right) = -3\left(\frac{1}{2}\right) + 4 \][/tex]
[tex]\[ f\left(\frac{1}{2}\right) = -\frac{3}{2} + 4 \][/tex]
Para realizar a soma, vamos colocar 4 no mesmo denominador:
[tex]\[ f\left(\frac{1}{2}\right) = -\frac{3}{2} + \frac{8}{2} \][/tex]
[tex]\[ f\left(\frac{1}{2}\right) = \frac{-3 + 8}{2} \][/tex]
[tex]\[ f\left(\frac{1}{2}\right) = \frac{5}{2} \][/tex]

### c) [tex]\( x = 0 \)[/tex]
Substituímos [tex]\( x \)[/tex] por 0 na função:
[tex]\[ f(0) = -3(0) + 4 \][/tex]
[tex]\[ f(0) = 0 + 4 \][/tex]
[tex]\[ f(0) = 4 \][/tex]

### d) [tex]\( x = k + 1 \)[/tex]
Substituímos [tex]\( x \)[/tex] por [tex]\( k + 1 \)[/tex] na função:
[tex]\[ f(k + 1) = -3(k + 1) + 4 \][/tex]
[tex]\[ f(k + 1) = -3k - 3 + 4 \][/tex]
[tex]\[ f(k + 1) = -3k + 1 \][/tex]

### Resumo dos valores calculados:
a) [tex]\( f(1) = 1 \)[/tex]

b) [tex]\( f\left(\frac{1}{2}\right) = \frac{5}{2} \)[/tex]

c) [tex]\( f(0) = 4 \)[/tex]

d) [tex]\( f(k + 1) = -3k + 1 \)[/tex]

Esses são os valores numéricos da função [tex]\( f(x) = -3x + 4 \)[/tex] para os valores de [tex]\( x \)[/tex] fornecidos.
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