Question

Calculati:
(x²+x+1)² -(x²+x)²

Answer 1

(x²+x+1)² -(x²+x)² = $(x^{4} + x^{2} + 1) - ( x^{4} + x^{2} ) = x^{4}+x^{2} - x^{4} + x^{2} = 0$
 (x²+x+1)² -(x²+x)² = 1
 *poza e mai corecta * 

Answer 2

E(x) = (x² + x+ 1 +x² +x)( x² +x +1 - x² - x) = (2x² + 2x +1)·1 = 2x² + 2x +1