Question

rezultatul:
$(x - 1) {}^{2} + (x + 1) {}^{2} - 2(x + 2)(x - 2) =$
a)0
b)8
c)5
d)10
​

Answer 1

Răspuns:

(x²-2×x×1+1²)+(x²+2×x×1+1²)-2(x²-2x+2x-4)=

x²-2x+1+x²+2x+1-2x²+8=

2x²-2x²=0

-2x+2x=0

1+1+8=10