Answer:
B. Subtract 5 from both sides and then square both sides.
Explanation:
First, subtract 5 from both sides in order to get
![√(x-6)=7^(2)](https://img.qammunity.org/2021/formulas/mathematics/college/i6rjp2e24wofvhxclpyg0b24km0yt26dam.png)
Second, square both sides in order to get
(p.s. squaring both sides gets rid of the square root)
Third, add 6 to both sides in order to get x=55
Last, see that the answer is B, as you had to subtract 5 from both sides and then square both sides to get your answer
There you go, and good luck on the other questions!