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

    May 31, 2012, 12:45 PM
    Algebra Proof
    Justify each step of the proof. Conjecture: If 2(x^2+5)=60, then x is 5, or -5.
    1. 2(x^2 + 5) = 60
    2. 2x^2 + 10 = 60
    3. 2x^2 = 50
    4. x^2 = 25
    5. x
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    May 31, 2012, 03:10 PM
    Quote Originally Posted by bsikor View Post
    Justify each step of the proof. Conjecture: If 2(x^2+5)=60, then x is 5, or -5.
    1. 2(x^2 + 5) = 60
    2. 2x^2 + 10 = 60
    3. 2x^2 = 50
    4. x^2 = 25
    5. x
    Looks like yuo're just missing step 5:
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