Respuesta :

Hey there!

Given,

a+1 = 3

To find:

(a - 1)^2

[tex] {a}^{2} - 2.a.b + {b}^{2} \\ \\ a - 2a + 1 \\ \\ 1 + 1 = 2[/tex]

So, the answer is 2

Hope it help you