7.Descompuneti:
a)x^2+3x+2 e)x^2+7x+10 i)x^2+11x+30
b)x^2+5x+4 f)x^2+9x+20 j)x^2+15x+56
c)x^2+7x+12 g)x^2+8x+15 k)x^2+12x+27
d)x^2+5x+6 h)x^2+9x+14 L)x^2+12x+35