Question

(x+1)-(x-1) ......cum se face

Answer 1

(x+1)-(x-1)
x+1-x+1
x-x=0
1+1=2
S={2}
1) Desfacem parantezele
2) Subliniem termenii asemenea si calculam.
Succes!=)

Answer 2

$(x+1)-(x-1) = (x+1)-x+1 = \\ \\ = x+1-x+1 = \underline{x}+\underline{\underline{1}}-\underline{x}+\underline{\underline{1}}= \\ \\ =0 + 2 = 2$