SOLUTION: What is the solution set of the equation x^2+2x-15=0? thanks for your help.

Question 602526: What is the solution set of the equation x^2+2x-15=0?

thanks for your help.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given equation.

Notice that the quadratic is 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 solutions are or

This means that the solution set is {3,-5}

Note: order of the solutions doesn't matter as you can also write the solution set as {-5,3}
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