Respostas

2014-06-29T21:51:27-03:00

A)x²+x=0
x(x+1)=0
x=0 e x= -1

B)3x²+7x=0
x(3x+7)=0
x=0 e x=-7/3

C) 5x²-x=0
x(5x-1)=0
x=0 e x=1/5

D) -3x²+15x=0
x(-3x+15)=0
x=0 e x=-5

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