Developper (x+6)(x+2)-(x+6)(3x-1) Svp maths 3 eme

Bonjour,

(x + 6)(x+2) - (x +6)(3x -1)
= x^2 +2x +6x +12 -(3x^2 -x +18x -6)
= x^2 +2x + 6x +12 -3x^2 +x -18x +6
= -2x^2 -9x +18

=}