Răspuns :
= x ( x^2 - 7x + 12) = x( x^2 - 4x - 3x + 12 ) =x[( x-4) - 3( x-4) ] = x ( x-4) ( x -3)
E(x)= x³-7x²+12x = x(x²-7x+12)= x(x²-4x-3x-12) = x [ x(x-4) - 3(x-4)]
= x(x-4)(x-3)
= x(x-4)(x-3)