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Rezolvati ecuatia (X-1)^2+(x-2)^2+....+(x-1000)^2=(x+1)^2+(x+2)^2+....+(x+1000)^2 . ^2 - la puterea a 2 a

Răspuns :

 (x-1)²+(x-2)²+....+(x-1000)²=(x+1)²+(x+2)²+....+(x+1000)²
x²-2x+1 + x²-4x+1+.....+x²-2000x+1000000=
=x²+2x+1 + x²+4x+1+.....+x²+2000x+1000000
-2x-4x-...-1000x=2x+4x+.....1000x
4x+8x+.....+2000x=0
4x(1+2+....500)=0
4x*500(500+1)/2=0
50100x=0
x=0