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 understandcould 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 xterm (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 lefthand side to squared form. Simplify the righthand side. (x + 3)2 = 16
Squareroot both sides. Remember to do "±" on the righthand 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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