Respostas

2014-07-22T19:15:27-03:00
A)3x²=0
 x²=-3
 x= √-3

b)-9x²=0 
 x²=9
 x= √9
x=3

c)7x²-10=0
7x²=10
x²=10/7
x= √10/7

d)x²-81=0
x²=81
x= √81
x=9

e)x²+64=0
x²=-64
x= √-64

f)2x²+6x=0
x . ( 2x + 6) = 0 
2x + 6 = 0 
2x = -6 
x = -6/2 
x = -3 

g)-x²+x=0
x(-x+1)
-x+1=0
-x=-1 * (-1)
x=1
espero ter te ajudado.rs