Réponses

2014-09-21T13:59:49+02:00
A=(5-t)^{2}
  =5^{2} -2*5*t + t^{2}
=25 -10t + t^{2}

B=(x-8)^{2}
=x^{2} -2*x*8 + 8^{2}
=x^{2} -16x +64

C=(4y-1)^{2}
=(4y)^{2} -2*4y*1 + 1^{2}
=16y^{2} -8y + 1

D=(3x-7)^{2}
=(3x)^{2} -2*3x*7 + 7^{2}
=9x^{2} -42x + 49

voila