Respostas

2013-07-04T10:50:10-03:00
4x²=4x-1 
x² = 4-1-4 ( anula o x, soma de sinais = 0)
x² = 9
x² = Raiz quadrada de 9
X= 3
2013-07-04T11:15:56-03:00
4x^2-4x+1=0

delta= (-4)^2-4*4*1 = 0

x= -b/2*a = -(-4)/2*4 = 4/8 = 1/2

A resposta é 1/2

conferindo: 4*(1/2)^2 = 4*1/2 -1

4*1/4 = 2-1 (V)