Question

Dado as funçoes f(X)=2x+12, g(x) = -2+5 calcule
a) f(3)
b) f(-5)
c) g(10)
d) f(-1)+g(2)
e) g(3)+f(2)

Answer 1

f(x) = 2x + 12
g(x) = - 2x+5 calcule:

a)  x = 3

f(x) = 2x + 12
f(3) = 2.3 + 12
f(3) = 6 + 12
f(3) = 18

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b)
f(x) = 2x + 12
f(-5) = 2.(-5) + 12
f(-5) = - 10 + 12
f(-5) = 2

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c)
g(x) = - 2x + 5
g(10) = - 2(10) + 5
g(10) = - 20 + 5
g(10) = - 15

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d)
R.: f(-1) + g(2) = 1 + 10 = 11

f(-1) = 2.(-1) + 12
f(-1) = - 2 + 12
f(-1) = 10

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g(2) = - 2.2 + 5
g(2) = - 4 + 5
g(2) = 1

R.: f(-1) + g(2) = 10 + 1 = 11

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e)
R.: g(3) + f(2) = - 1 + 16 = 15

g(x) = - 2x + 5
g(3) =  - 2.3 + 5
g(3) = - 6 + 5
g(3) = - 1

f(x) = 2x + 12
f(2) = 2.2 + 12
f(2) = 4 + 12
f(2) = 16

R.: g(3) + f(2) = - 1 + 16 = 15