Răspuns:
a)(x+1)²+(x-1)²
x²+2x+1+x²-2x+1
2x²+2
b(x-3)²+(x-3)(x+3)
(x-3)×(x-3+x+3)
(x-3)×2x
2x×(x-3)
c)(x+2)(x-2)+(x+4)²-2x²
x²-4+x²+8x+16-2x²
0+12+8x
12+8x
d)(2-x)²-(x+3)(x-3)-x(x-1)
4-4x+x²-(x²-9)-x²+x
13-3-x²
-x²-3x+13
e)(x+5)²-2(x-5)(x+5)+x²
x²+10x+25-2(x²-25)+x²
0+10x+75
10x+75
f)(6-x)²-3(x+2)-5(x+1)
36-12x+x²-3x-6-5x-5
25-20x+x²
x²-20x+25
