Réponses

  • Utilisateur Brainly
2013-10-29T13:25:50+01:00
S= (2x+1)² -2(2x+1)+1
=(2x+1-1)²
=4x²

T= (2+x)² -(3x-1)²
=(2+x+3x-1)(2+x-3x+1)
=(4x+1)(-2x+3)

U= 7(4x²-1) -18(2x+1)²
=(2x+1)(7(2x-1)-18(2x+1))
=(2x+1)(-22x-25)

V= 4(x-1)² -9(2x+3)²
=(2x-2+6x+9)(2x-2-6x-9)
=(8x+7)(-4x-11)

W= 9- (2a-5)²

=(3+2x-5)(3-2x+5)
=(2x-2)(-2x+8)