Question

Fill in the blank to make the expression a perfect square?Y^2 - 2y + blank

Answer 1

We need to find a perfect square from the expression

$y^2-2y$

In this regard, we can note that

$(y-1)^2=y^2-2y+1$

Then, by comparing this result with our expression, we can see that the blank space is 1 because

$y^2-2y+1=\left(y-1\right)^2$

Therefore, the answer is: