(x+8)(x-9)=0 ⇒ (x+8)=0 ∨ (x-9)=0, x∈W
x+8=0 ∨ x-9=0
x=-8 ∨ x=9
Pozdrawiam
(x+8)(x-9)=0
x+8=0 U x-9=0
x = -8 U x=9
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(x+8)(x-9)=0 ⇒ (x+8)=0 ∨ (x-9)=0, x∈W
x+8=0 ∨ x-9=0
x=-8 ∨ x=9
Pozdrawiam
(x+8)(x-9)=0
x+8=0 U x-9=0
x = -8 U x=9