Răspuns :
n =(4x+3)²-2(5x-3)(x+1)-2x(3x+10 )
n=16x²+24x+9 - 2(5x²+5x-3x-3)-6x²-20x
n=16x²+24x+9 - 10x²-4x+6-6x²-20x
n=15 divizibil cu 5
n=16x²+24x+9 - 2(5x²+5x-3x-3)-6x²-20x
n=16x²+24x+9 - 10x²-4x+6-6x²-20x
n=15 divizibil cu 5