Va rog rezolvati !!!!

Răspuns:
(x+1) ^2 = x^2 +2x1x X+1^2 =x^2 +2x+1
(x+5)^2 = x^2 +2x X5+5^2=x^2 +10x+25
(2x+3)^2 =4x^2 +2x X3+3^2=4x^2 +6x+9
(x+7)(x-7)=x^2 - 7x+7x-49=x^-49
(3-x)(3+x)=9+3x-3x-x^2 =9-x^2