Question

Dadas as funções f(x) = 3x-1/2 e g(x) = 1+x/x determine o valor numérico de:

a) f(3) + f(5) . g(2)

b) f(-1) . g(-3) + g(7)

Answer 1

a)

f(3) = 3.3 –1/2 >>> f(3) = 9 – 1/2 >>> f(3) = 17/2

f(5) = 3.5 – 1/2 >>> f(5) = 15 – 1/2 >>> f(5) = 29/2 

g(2) = 1 + 2/2 >>> g(2) = 1 + 1 >>> g(2) = 2

logo: f(3) + f(5) . g(2) vale : 17/2 + (29/2 . 2) = 75/2  (só matemática básica agora)

b)

f(–1) = 3.–1 – 1/2 >>> f(–1) = –3 – 1/2 >>> f(–1) = –7/2

g(–3) = 1 + (–3/–3) >>> g(–3) = 1 + 1 >>> g(–3) = 2

g( 7) = 1 + 7/7 >>> g(7) = 1 + 1 >>> g(7) = 2

Logo, f(x) . g(x) + g(x) vale: –7/2 . 2 + 2 = – 5


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