Question

Qual o valor numérico de 2x³ - 4x² + x - 1 , quando x = (Um meio) Denominador 1
Numerador 2

Answer 1

2x³ - 4x² + x - 1 =

x=1/2

2(1/2)^3 - 4(1/2)^2 + 1/2 -1=
2*1/8 -4*1/4 + 1/2 - 1=
2/8 -4/4 +1/2 -1=
1/4 - 1 + 1/2 -1=
mmc=4
1/4-4/4+2/4-4/4=
-8/4 + 3/4=
-5/4= -1 1/4 ou -1,25