Complete the table by providing justification for each step of the proof

Conjecture: If 4 (x^2-2) = 28, then xis 3 or - 3

4 (x² - 2) = 28

1. Distribute the 4

4x² - 8 = - 28

2. Plug in 3 and - 3

4 (3) ² - 8 = 28

4 (-3) ² - 8 = 28

3. Square 3 and - 3

4 (9) - 8 = 28

4 (9) - 8 = 28

28 = 28

The reason both answers are the same is because whenever you put a negative number to an even power, the result becomes positive because any negative multiplied by a negative number is always positive.

28 = 28