develloper puis reduire: help me A=7x-(-2x+1) (x-2) merci d'avance..

A=7x-(-2x+1)(x-2)
A=7x-(-2x^2+4x+x-2)
A=7x+2x^2-4x-x+2
A=2x^2+2x+2

A=7x-(-2x+1) (x-2)
A = 7x - ( -2x² +4x +x -2)
A = 7x +2x²-4x -x +2
A = 2x² +2x + 2