Answer:

x1 = 1 , x2 = 7

Step-by-step explanation:

3(4 - x)² = 27

3(4 - x)² ÷ 3 = 27 ÷ 3

(4 - x)² = 9

√(4 - x)² = √9

4 - x = ±3

4 - x = 3

-x = 3 - 4

-x = -1

-x ÷ (-1) = -1 ÷ (-1)

x = 1

4 - x = -3

-x = -3 - 4

-x = -7

-x ÷ (-1) = -7 ÷ (-1)

x = 7