Question

1) Dada a função f R → R definida por f (x)= x²-5.Determine.
a) f (1/2)
b) f (-1) - (1/2)

Answer 1

f(x)=x²-5

a) f(1/2)= (1/2)²-5=1/4-5=1-20/4=-19/4

f(-1)=(-1)²-5=1-5=-4

b) -4 - (-19/4)= -4+19/4=-16+19/4=3/4