Respostas

2013-10-14T21:42:55-03:00
A 4x+5=x+2         
4x-x=2-5
3x=-3 
x=3/-3
x=-1

B 4-5x=4-5x
5x+5x=4-4
10x=0
x=10/0
x=0

D 2x²-3x+11
(delta)= b²-4.a.c
(delta)= (-3)².2.11
(delta)= 9.22
(delta)=196

x=-b+- (raiz de delta)/2.a
x= -(-3) +- 14/4
x= 3 +-14/4
x¹= 3+14/4=4,25
x²= 3-14/4=2,75

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