Răspunsuri

2014-05-14T17:38:52+03:00
A)   x^{2} -4x=0

x(x-4)=0⇒x=0, x=4

b) 2x²+x=0
x(2+x)=0, x=0, x=-2

c)  -4x²+6x=0
-2x(2x-3)=0
x=0, x=2/3
d) 5x²=0, x=0