Question

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

Answer 1

Răspuns:

(x^2+2x+2x+4) +(x^2+3x+3x+9) -(2x^2+4x+x+2) =

= x^2+4x+4 + x^2+6x+9-2x^2-5x-2

(X^2 + x^2 -2x^2 se elimina pt ca =0 )

= 5x+11

X^2 = x la puterea a doua (x patrat )