Răspunsuri

2014-06-09T18:27:33+03:00
A. x-1=+-1
x-1=1⇒x=2
x-1=-1⇒x=0
b.  x=0
c.  x²+6x-7=0 (s=-6, p=-7)
x₁=-7 x₂=1
d. (x-2-2)(x-2+2)=0
(x-4)x=0
x₁=4  x₂=0
e. (2x-3)(2x+3)=27
4x²-9=27
4x²=36
x²=9
x²-9=0
(x-3)(x+3)=0
x₁=3, x₂=-3