Question

E(x)=(1+x)(1-x)+(x+2)la a 2 -2(x+2),unde x este numar real. Determinati numarul real a pentru care E(a)= -1

Answer 1

rezolvare..................

Answer 2

[tex]E(x)=(1+x)(1-x)+(x+2)^2-2(x+2) \\ E(x)=1-\not{x^2}+\not{x^2}+4x+\not4-2x-\not4 \\ E(x)=4x-2x+1 \\ E(x)=2x+1 \\ 2a+1=-1 \\ 2a+1=-1-1 \\ 2a=-2 \\ \boxed{a=-1}[/tex]