factoriser les expressions suivantes A.6ab+15ac B.(x-3)(x+2)-(x-3)(x-5) C.4x^-25​

6ab+15ac

6×a×b + 15×a×c

6×15+a×a+b×c

90+a^2+bc

(x-3)(x+2)-(x-3)(x-5)

x^2 +(-6)-x^2+15

9+2x^2

4x^2-25

4×x^2-25

(4×25)×x^2

100x^2