Answer:
We conclude that the value of 'a' will be:

Hence, option (2) is true.
Explanation:
Given the equation
x = 2a - b²
Let us solve the equation to solve for 'a'

switching sides

Add b² to both sides

Simplify

Divide both sides by 2

Simplify

Therefore, we conclude that the value of 'a' will be:

Hence, option (2) is true.