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    hanselandgretel's Avatar
    hanselandgretel Posts: 1, Reputation: 1
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    #1

    Feb 27, 2012, 06:42 PM
    x^2 + 2x - 13= 0
    Please solve simply don't explain, using the india method
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Feb 29, 2012, 12:42 PM
    I believe you're asking about a technique in which you:

    1. Move the constant to the right side of the equation: x^2 +2x = 13
    2. Add the square of one half the x coefficent to both sides: here the coefficient is 2, so one half of that is 1, and 1 squared is 1: x^2 +2x + 1 =14
    3. The left hand side is now a square: (x+1)^2 = 14
    4. Take the square root of both sides, but realize that it may be either positive or negative: x+1 = +/- sqrt(14)
    5. Get x by itself: x = -1 +/- sqrt(14)

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