Question

x(x-2)+2(x-1)totul la puterea2 +(x-1)(x+1)-4(x la puterea 2 +1)

Answer 1

Calculele sunt anexate !

Answer 2

x ( x - 2 ) + 2 ( x - 1)² + ( x - 1 ) ( x + 1 ) - 4 ( x² + 1) =  - 3 ( 2 x + 1) 

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

= 2 x² - 2 x + 2 x² - 4 x + 2 -- 4 x² - 5 =

= 4 x² - 4 x² - 2 x - 4 x + 2 - 5 =

=  0  - 6 x - 3 = 

= - 6 x - 3 = 

= - 3 ( 2 x + 1)