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f'(x)=2x-2x
f'(x)=0
x=——————
............2a
a=1. b=2. c=5
....-2±√(2)²[4(1)(5)]
x=————————
..............2(1)
....-1±√4[(4)(5)]
x=——————
............2
.....-1±√(4)(20)
x=——————
.............2
.....-1±√80
x=————
..........2
......-1+8.94
x1=————
............2
.......7.94
x1=———
..........2
x1=3.97
.......-1-8.94
x2=————
.............2
.......-9.94
x2=———
...........2
x2=-4.97