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Thread: 7(x+3)=2x+51

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    Board Regular xeven_'s Avatar
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    Default 7(x+3)=2x+51

    I am having trouble in math class. Can excel 2011 solve these types of equations? Can a calculator solve them?

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    Default Re: 7(x+3)=2x+51

    Isn't that the same as:

    5x=30

    giving 6 as the value of x?
    Microsoft MVP - Excel

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    Board Regular xeven_'s Avatar
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    Default Re: 7(x+3)=2x+51

    the problem is asking fort the solution and 30 isn't
    working.

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    MrExcel MVP Aladin Akyurek's Avatar
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    Default Re: 7(x+3)=2x+51

    No, Excel cannot, but you can.
    Assuming too much and qualifying too much are two faces of the same problem.

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    MrExcel MVP Rick Rothstein's Avatar
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    Default Re: 7(x+3)=2x+51

    Quote Originally Posted by xeven_ View Post
    I am having trouble in math class. Can excel 2011 solve these types of equations? Can a calculator solve them?
    Rather than have Excel produce a "magic number" for you, it would be better if you learned how to solve these type of equations for the unknown. When you see something structured like this...

    7(x+3)

    you can multiply the 7 through the parentheses to produce this...

    7x + 7*3

    which, when you perform the indicated multiplication, becomes..

    7x + 21

    So this...

    7(X + 3) = 2X + 51

    is the same as this...

    7X + 21 = 2X + 51

    Subtract 21 (the minimum of the two numbers that are not multiplied by X) from both sides of the equation (which does not change the equation because the same thing was done to both sides)...

    7X + 21 - 21 = 2X + 51 - 21

    which yields...

    7X = 2X + 30

    Now subtract 2X (the minimum of the two values involving X) from both sides of the equation...

    7X - 2X = 2X - 2X + 30

    which yields...

    5X = 30

    Dividing both sides by 5 (the value in front o the X)...

    5X / 5 = 30 / 5

    which yield...

    X = 6
    Rick's "mini" blog... http://www.excelfox.com/forum/f22/
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    Want to post a small screen shot? See Part B here.

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    Board Regular xeven_'s Avatar
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    Default Re: 7(x+3)=2x+51


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    MrExcel MVP Rick Rothstein's Avatar
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    Default Re: 7(x+3)=2x+51

    Quote Originally Posted by xeven_ View Post
    Does that emoticon mean you are surprised at how easy the calculation is... or is it more of a "What the heck is he talking about"?
    Rick's "mini" blog... http://www.excelfox.com/forum/f22/
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    Board Regular xeven_'s Avatar
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    Default Re: 7(x+3)=2x+51

    Uhm that means I may as well be reading chinese because that is exactly how I feel when I see all that. But thanks for your time I know your calculations are correct.

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    Default Re: 7(x+3)=2x+51

    I don't quite remember that far back, but isn't this like 7th or 8th grade math?

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    Default Re: 7(x+3)=2x+51

    The thing is true but I had a lot of problems during that time and my math skills really never advanced much further than basic addition,subtraction,multiplication and division.

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