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x=0 v x=1 v x=-1
Delta = b²+4ac
delta = 64-28 = 36
x1=-b-√delty ......... 8-6
.... ----------........ = ..------ = 1
. ..... 2a ................. 2
x2=-b+√delty ........ 8+6
. ...---------- ...... = -------- = 6
....... 2a .............. 2a
(omin kropeczki)
x3=0
bo chyba zapomnialas o x²
jak nie to
x³-8x+7x=0
x(x²-1)=0
x=0
x=-1
x=1