The process of completing the square is done for f(x) = x^2 +10x + 21 to be changed into a vertex form..which step shows Three steps toward this process? why did you pick your answer ?

And for this case we can begin completing the square like this:

And after aggrupate the terms we got:

And finally we have:

And for this case our vertex would be:

Step-by-step explanation:

For this case we have the following equation given:

And we want to find a formula in terms in the vertex form given by:

And for this case we can begin completing the square like this:

And after aggrupate the terms we got:

And finally we have:

And for this case our vertex would be: