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2014-04-02T15:25:06+03:00

X(X-2)² + 2(3X² - 1) - 5X=0

X(X² - 4X + 4) + 6X ² - 2 - 5X=0

X³ - 4X² + 4X + 6 X² - 5X - 2 =0

X³ + 2X² - X - 2 = 0

X³ + 2X²  - (X +2)=0

X²(X + 2) - (X + 2)=0

(X  +2)(X²-1)=0

(X+2)(X-1)(X+1)=0

X+2=0 ⇒X=-2

X-1=0

X=1

X+1=0

X=-1