Bonsoir j’ai un dm de maths pour demain merci d’avance.

Bonsoir,

6(2x-5)² = 6(4x²-20x+25) = 24x²-120x+150

5x(x-8)+(x+2)(x-1) = 5x²-40x+x²-x+2x-2 = 6x²-39x-2

(2x-3)(2x+3)+(x-1)(3x+1) = 4x²-9+3x²+x-3x-1 = 7x²-2x-10

(5x+2)²-3(x+1) = 25x²+20x+4-3x-3 = 25x²+17x+1

(5x-1)(2x-3)-(6x+5)(x-4) = 10x²-15x-2x+3-(6x²-24x+5x-20)

                                    = 10x²-6x²-15x-2x+24x-5x+3+20

                                    = 4x²+2x+23