Question

aflati valoarea expresiei E(X)=X^3+2X^2-3X supra X^2+3X

Answer 1

E(x)=x^3 + 2x^2 -3x /x^2 +3

E(x)= x(x^2+ 2x-3)/x(x+3)
E(x)=x^2 + 2x -3/x+3
=x^2 + 6x-4x+9-12/x+3
= (x+3)^2 -4x-12/x+3
=(x+3)^2-4(x+3)/x+3
=(x+3)(x+3-4)/x+3
=x+3-4
= x-1