Sagot :
2(3x+3)au carré +6+2x =
2*(3x+3)²+6+2x=
2*(9x²+18x+9)+6+2x=
18 x² + 36x + 18 + 6 + 2x=
18 x² + 38x +24=
2*(9x² +19 x +12)
2*(3x+3)²+6+2x=
2*(9x²+18x+9)+6+2x=
18 x² + 36x + 18 + 6 + 2x=
18 x² + 38x +24=
2*(9x² +19 x +12)