Question

Sendo f e g definidas, respectivamente, por f(x) = - 2x +1 e g(x) = 3x + 2. Calcule:
a) f(1) + g(1)
b) f(-1) + g(-1)
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Answer 1

f(x) = - 2x +1

f(1) = -2.1 + 1

f(1) = - 1

g(x) = 3x + 2

g(1) = 3.1 + 2

g(1) = 5

f(1) + g(1) =

-1 + 5=

4

b) f(-1) = -2.(-1) + 1

f(-1) = 3

g(-1) = 3.(-1) + 2

g(-1) = -1

f(-1) + g(-1) =

3 - 1 =

2