Bonjour;
a) (x+5)+3(x+2)
= x+5 +3x+6
= 4x +11
b) 5(x-4)+(x+4) ²
IR
= 5x-20 +x² +8x +16
= x² +13x -4
c) (x+2) (x-2)+(x+3)²
2 IR
x² -4 +x²+6x +9
= 2x² +6x +5
d) (x+4)(x-3)(x-5)
= (x² -3x +4x -12) (x-5)
= (x² +x -12)( x-5)
= x³ -5x² +x² -5x -12x +60
= x³ -4x² -17x +60
