1)
a = 2(3x-1)²
= 2(9x²-6x+1)
= 18x²-12x+2
b = 3(x+√2)²-2(x+√2)(x-√2)
= 3(x²+2x√2+2)-2(x²-2)
= 3x² +6x√2+6-2x²+4
= x² + 6x√2+10
2)
c = (2x-3)²+5(2x-3)
= (2x-3)(2x-3) + 5(2x-3)
= (2x-3)[(2x-3)+5]
= (2x-3)(2x+2)
Tu es sûre de ton énoncé pour les 2 derniers ?