Question

Ajutati-ma va rog repede!
Ex 1

Answer 1

b)(x+2)(x²+4x+1)-x-2=(x+2)(x+2)²-(x+2)=

(x+2)[(x+2)²-1]=(x+2)[(x+2-1)(x+2+1)]=

(x+2)(x+1)(x+3)

c)E(x)=(x+2)(x+1)(x+3)/x²+5x+6 =>

E(x)=(x+2)(x+1)(x+3)/(x+2)(x+3) =>

E(x)=x+1

E(n)=n+1 si cum n€N => n+1€N