Question

Considerando cada item abaixo, determine f(3)+g(3)

a) f(x)= g(x)=-×

b) f(x)=-x+1 g(×)=-x-1

c) g(x)=-2x+3 f(x)=2x+1

d)
$f(x) = - \frac{1}{2} g(x) = x$

Me ajudem pfvv​

Answer 1

Para encontrar os valores de f(3) e g(3), basta substituir x por 3:

a) f(x) = -x → f(3) = -3

g(x) = -x → g(3) = -3

f(3) + g(3) = -3 + (-3)

f(3) + g(3) = -6

b) f(x) = -x + 1 → f(3) = -3 + 1 = -2

g(x) = -x - 1→ g(3) = -3 - 1 = -4

f(3) + g(3) = -2 + (-4)

f(3) + g(3) = -6

c) f(x) = -2x + 3 → f(3) = -2.(-3) + 3 = 9

g(x) = 2x + 1 → g(3) = 2.3 + 1 = 7

f(3) + g(3) = 9 + 7

f(3) + g(3) = 16

d) f(x) = -1/2 → f(3) = -1/2

g(x) = x → g(3) = 3

f(3) + g(3) = -1/2 + 3

f(3) + g(3) = -1/2