Respostas

2014-04-02T13:38:52-03:00
Para se obter a resposta, basta substituir o x por 1/2.
f(x)=3x²-x+4, p/ f(1/2) => f(1/2) = 3(1/2)² - (1/2) + 4 =>  f(1/2) = 3.1/4 - 1/2 + 4 =>
=>  f(1/2) = 3/4 - 1/2 + 4 // mmc (4,2) = 4 =>  f(1/2) = [3 - (2) + 16]/4 =>  f(1/2) = 17/4
2014-04-02T13:40:39-03:00
 f(x)=3x²-x+4
f(1/2)=3.(1/2)²-1/2+4
f(1/2)=3.1/4-1/2+4
f(1/2)=3/4-1/2+4 <-----------aplica-se o MMC
f(1/2)=6-4+32
f(1/2)=34
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