Question

$( \frac{a}{2} - 1 {)}^{2}$

Answer 1

(a/2 - 1)^2
a^2/4 - a + 1
a^2/4 - 4a/4 + 4/4 = 0
a^2 - 4a + 4 = 0

Baskara:

(4+-√16-4×4)÷2
(4+-√0)÷2
4÷2
2

a = 2