Question

2) Dada a função f(x) = 5x + 2, calcule:
a) f(2)
b) f(5)
c) f(-3)

Answer 1

• Para f(2) = 12

• Para f(5) = 27

• Para f(-3) = -13

Apenas substituimos as Incógnitas pelos valores dados, Veja o cálculo abaixo:

$\boxed{\begin{array}{c} \\ \\\sf f(x) = 5x - 2, \: f(2) \\\\\\\sf f(2) = 5.2+2 \\\\\sf f(2) = 10+2 \\\\\sf f(2) = 12 \\\:\end{array}} \boxed{\begin{array}{c} \\ \\\sf f(x) = 5x - 2, \: f(5) \\\\\\\sf f(5) = 5.5+2 \\\\\sf f(5) = 25+2 \\\\\sf f(5) = 27 \\\:\end{array}} \boxed{\begin{array}{c} \\ \\\sf f(x) = 5x - 2, \: f(-3) \\\\\\\sf f(-3) = 5.(-3)+2 \\\\\sf f(-3) = -15+2 \\\\\sf f(-3) = -13 \\\:\end{array}}$

Resposta:

• Para f(2) = 12

• Para f(5) = 27

• Para f(-3) = -13

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