Question

dada a função f(x)= x+1÷x calcule:
A) f(3)
B) f(-1)
C) f(1) + f(2)
D) f(½)
Me ajudem por favor

Answer 1

f(x) = x + 1/x

A) f(3) = 3 + 1/3
f(x) = 3/1 + 1/3 = (3*3/3) + 1/3 = 9/3 + 1/3 = 10/3

B) f(-1) = -1 + 1/-1 = -1 -1 = -2

C) f(1) + f(2)

f(1) = 1 + 1/1 = 2
f(2) = 2 + 1/2 = 2/1 + 1/2 = 4/2 + 1/2 = 5/2

f(1) + f(2) = 2 + 5/2 = 2/1 + 5/2 = 4/2 + 5/2 = 9/2

D) f(1/2) = 1/2 + 1/(1/2) = 1/2 + 2/1 = 1/2 + 4/2 = 5/2