Resposta :

BabieJr
 f(x)=x²-x+1
a) f(0)=0²-0+1
f(0) = 1

b) f(1/2)= (1/2)²-1/2+1
f(1/2)=1/4-1/2+1
f(1/2)= 1/4-2/4+4/4
f(1/2)=3/4

c)f(5)= 5²-5+1
f(5)=25-5+1
f(5)=21

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