Răspuns :
=3x la a doua ( adica 2x la adoua +x la a doua)+2x ( adica -3x+5x) -3(adica 1-4)
=3x la a doua +2x-3
=3x la a doua +2x-3
2x la a doua + x la a doua + 5x - 3x +1 - 4 = 3x^2 + 2x - 3 ( ^ 2 inseamna la a doua )