Verified answer

Ответ:

4

Объяснение:

[tex] = \frac{1}{a - 1} \times \sqrt{ {(4a - 4)}^{2} } = \frac{1}{a - 1} \times (4a - 4) = \frac{1}{a - 1} \times 4(a - 1) = 4[/tex]