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Math Help - Please help me solve this equation.

  1. #1
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    Please help me solve this equation.

    X+1=2(6X-18)

    I am aware that the answer is x=4 but I am unsure of how that answer came about.
    Thanks in advance.
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  2. #2
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    Quote Originally Posted by GLAMX View Post
    X+1=2(6X-18)

    I am aware that the answer is x=4 but I am unsure of how that answer came about.
    Thanks in advance.
    Expand the right hand side and then simplify the equation. The answer is NOT X = 4 (as can easily be confirmed by simple substitution).
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  3. #3
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    Thumbs up Here's what I think!

    x+1=2(6x-18)
    x+1=12x-36
    x-12x=-36-1
    -11x=-37
    x=37/11
    Verification-
    x+1=2(6x-18)
    LHS=x+1=(37/11) + 1 = 48/11
    RHS=2(6x-18)=2[6(37/11)-18]=2(24/11)=48/11
    so LHS=RHS
    Hence x=37/11

    As you have said before, x=4, hence by trying that
    LHS=x+1=4+1=5
    RHS=2(6x-18)=2(24-18)=2(6)=12
    so RHS is not equal to LHS and hence x is not equal to 4.

    If you know an answer, then try that answer of yours into the question in case of, an equality. Like, in this case if we would have presumed the answer as x=4 and hadn't tried it on the equation, we won't have got the answer.

    So if you get an answer wrong on an equation, try solving it again until you get the answer that satisfies your equation.

    Hope this helped you!
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