Question

Va rog exercitiul 4 de la subiectul 2

Answer 1

    
[tex]a) \\ x^2-8x+12 = \\ = x^2-2x-6x+12=x(x-2)-6(x-2)=(x-2)(x-6) \\ b) \\ 4x^2-20x+25 = \\ 4x^2-10x-10x+25= 2x(2x-5)-5(2x-5)=(2x-5)(2x-5) \\ c) \\ 5x(x-3)-3(x-3)=(x-3)(5x-3) \\ d) \\ x^2-49 = (x+7)(x-7)\\ e) \\ x^3+9x^2-4x-36= \\ =x^2(x+9)-4(x+9)=(x+9)(x^2-4)=(x+9)(x+2)(x-2) [/tex]