Question

x^2-(x-1)(x+3)=
x^2-(x+1)(x+3)=
x^2-(x-1)(x-3)=
x^2-(x+1)(x-3)=

Answer 1

x^2-(x+1)(x-3)=x^2-(x^2-3x+x-3)=x^2-(x^2-2x-3)=x^2-x^2+2x+3=2x+3

Answer 2

Ответ:

3,1=22-5=17,5

Объяснение: