Bonjour,
8x² + 2x(3x + 1)² + (3x + 1)²
= 8x² +2x ( 9x² +6x+1) + 9x² +6x +1
= 8x² + 18x³ + 12x² + 2x +9x² +6x +1
= 18x³ + 29x² + 8x +1
Bonjour,
Développer :
= 18x²+2x(3x+1)²+(3x+1)²
= 18x²+2x(9x²+6x+1)²+(3x+1)²
= 18x²+2x(9x²+6x+1)²+9x²+6x+1
= 18x²+18x³+12x²+2x+9x²+6x+1
= 39x²+18x³+2x+6x+1
= 39x²+18x³+8x+1
Bonne journée.
