SOLUTION: My book gives an example of an quadratic equation, but I do not understand how it has been worked. Here is the one that I have to turn in on my home work x2-2x-13=0,and here is the

Question 180712: My book gives an example of an quadratic equation, but I do not understand how it has been worked. Here is the one that I have to turn in on my home work x2-2x-13=0,and here is the example from the book: My e-mail address is, glen.a.harris@windstream.net
x2+3x-10=0
x2+3x=10
4x2+12x=40
4x2+12x+9=40+9
4x2+12x+9=49
2x+3=+7
2x+3=7 2x+3=-7
2x=4 2x=-10
x=2 x=-5

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
I'm not sure of the method that you're using, but here's the way that I'd do it:

Start with the given equation.

Notice we have a quadratic equation in the form of where , , and

Let's use the quadratic formula to solve for x

Start with the quadratic formula

Plug in , , and

Square to get .

Multiply to get

Rewrite as

Add to to get

Multiply and to get .

Take the square root of to get .

or Break up the expression.

or Combine like terms.

or Simplify.

So the answers are or

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