Bonjour, Factorisez : I=3(8 +5)+3 ( +1) Merci

bonjour

factoriser I = 3(8x+5)+3x(x+1)

I= 3(8x+5+x(x+1))

I= 3(8x+5+x²+x)

I= 3(9x+5+x²)