Question

(2-x)²+4(x-1)-x²= .....?

Answer 1

4-4x+x²+4x-4-x²= 0
 
 se simplifica -4x cu 4x  si x² cu -4x²  si 4 cu -4  si da 0

Answer 2

$(2-x)^{2} + 4(x-1) - x^{2} = \\ 4-4x+ x^{2} +4x-4- x^{2} =0$