oeufderaie

1)

B = (x-1)^2+4(-x+2)+(2x-1)(x+3)

B = x^2-2*1*x+1+4*-x+4*2+2x^2+6x-x-3

B = x^2-2x+1-4x+8+2x^2+6x-x-3

B = 3x^2-x+6

2) B = 3*1^2-1-6 = 3-1-6 = 8