Answer: y = 1 +/- 
<u>Step-by-step explanation:</u>
y² - 2y + 1 = x + 5
(y - 1)² = x + 5

y - 1 = +/- 
y = 1 +/- 
Look up the law of sines, I suggest Khan Academy. It is better if you know how to do it, it is very useful.
<span>What number should be added on both sides of the equation to complete the square is (-10/2)^2 or (10/2)^2 or 5^2 or 25.</span>