Question

упростите выражение
 х²-(х-1)(х+1)

Answer 1

x^2 - (x^2 - 1^2) = x^2 - x^2 + 1 = 1

Answer 2

x^2-(x-1)(x+1)= x^2-(x^2-1)= x^2-x^2+1=1