Posted by **Jamie** on Tuesday, September 21, 2010 at 5:46pm.

How do I solve a quadratic equation x^2 - x = 30 by completing the square-

I don't understand-could someone just explain the steps to solving this

- Algebra -
**Anna**, Tuesday, September 21, 2010 at 5:56pm
I found this example on purplemath

You coul use this and apply knowledge.

This is the original equation. x2 + 6x – 7 = 0

Move the loose number over to the other side. x2 + 6x = 7

Take half of the x-term (that is, divide it by two) (and don't forget the sign!), and square it. Add this square to both sides of the equation.

Convert the left-hand side to squared form. Simplify the right-hand side. (x + 3)2 = 16

Square-root both sides. Remember to do "±" on the right-hand side. x + 3 = ± 4

Solve for "x =". Remember that the "±" gives you two solutions. Simplify as necessary. x = – 3 ± 4

= – 3 – 4, –3 + 4

= –7, +1

- Algebra -
**jamie**, Tuesday, September 21, 2010 at 6:10pm
Thank you

- Algebra -
**Anna**, Tuesday, September 21, 2010 at 6:11pm
you're welcome!

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