Bonjour,
Factoriser:
1. A=3(x+4)+(x+4)(2x-5)= (x+4)(3(1)+2x-5)= (x+4)(3+2x-5)= (x+4)(2x-2)= 2(x+4)(x-1)
2. B=x²-10x+25= (x-5)²
3. C=x²-16= x²-4²= (x-4)(x+4)
4. D=(x+1)²-9= (x+1)²-3²= (x+1-3)(x+1+3)= (x-2)(x+4)
5. E=36x²-24x+4= (6x-2)²
6. F=x(10x-5)+4x²-1= 5*x(2x-1)+ (2x-1)(2x+1)= (2x-1)(5*x+2x+1)= (2x-1)(7x+1)