Algebra

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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 -

    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 -

    Thank you

  • Algebra -

    you're welcome!

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