Question

arati ca: ( x+2) totul la puterea 3 -x-2=(x+1)(x+2)(x+3),pentru orice  x nr real 

Answer 1

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

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

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

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

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