Question

Bom dia

Se f(x) = 2x +1. É correto afirmar que:
a) f(2) + f(3) = f(5)
b) f(2) + f(3) > f(5)
c) f(2) + f(3) < f(5)
d) f(2) × f(3) < f(5)
e) f(2) × f(3) = f(5)​

Answer 1

Resposta:

b) f(2) + f(3) > f(5)

Explicação passo a passo:

Calculamos f(2) ,f(3) e f(5):

f(2)

f(x) = 2x + 1

f(2) = 2 . 2 + 1

f(2) = 4 + 1

f(2) = 5

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f(3)

f(x) = 2x + 1

f(3) = 2 . 3 + 1

f(3) = 6 + 1

f(3) = 7

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f(5)

f(x) = 2x + 1

f(5) = 2 . 5 + 1

f(5) = 10 + 1

f(5) = 11

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b) f(2) + f(3) > f(5)  ,5 + 7 > 11 ,correto