Réponse:
A(x) = 5x*x+5x*(-1)+4*x+4*(-1)-(5x^2 + 2*5x*4+4^2)
A(x) = 5x^2 -5x+ 4x -4 - 25x^2 + 40 + 16
A(x) = - 20x^2 - 1x + 52
A(1) = - 20*1^2-1*1+52
A(1) = - 20-1+52
A(1) = - 21 + 52
A(1) = 31
A(-3) = - 20*(-3)^2-1*(-3)+52
A(-3) = - 180 - 3 +52
A(-3) = - 183 + 52
A(-3) = - 131
