Question

se f(x)=x²-4/x-1, achar f(1/2)

Answer 1

f(x) = (x^2 - 4)/ x - 1

f(1/2)= [(1/2)^2 -4] / 1/2 -1

obs:

1/2 -1 : -1/2
(1/2)^2 : 1/4
1/4 -4 : -15/4

f(1/2)= (-15/4)/-1/2

f(1/2)= -15/4 x -2/1

f(1/2)= 30/4 = 15/2 ou 7,5

espero ter ajudado

Answer 2

f(1/2) = (1/2)²-4 / 1/2 - 1 

f(1/2) = -15/4 / -1/2

f(1/2) = 15/2