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x-5=0 lub x+5=0 lub 2x-5=0
x=5 x=-5 2x=5
x=5/2
x=2,5
2x^3-5x^2-50x+125=0
-3x-50x=-125
-53x=-125/: -53
x=2,32
x2*25=(x-5)(x+5)
(x-5)(x+5)(2x-5)=0
x-5=0 lub x+5=0 lub 2x-5=0
x=5 lub x=-5 lub 2x=5 /:2
odp:
x=5 lub x=-5 lub x=2,5