SOLUTION: please help me solve this problem. y=x2+4x thats x squared. i need it written in vertex form.

Question 166637: please help me solve this problem.
y=x2+4x
thats x squared.
i need it written in vertex form.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
In order to write in vertex form, we need to complete the square for

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Completing the Square:

Start with the given expression.

Take half of the coefficient to get . In other words, .

Now square to get . In other words,

Now add and subtract . Notice how . So the expression is not changed.

Group the first three terms.

Factor to get .

So after completing the square, transforms to . So .

So is equivalent to .

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Start with the previous equation

Rewrite as

Place a "1" outside the parenthesis.

Now is in vertex form where , and
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