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Thread: Math help needed!

  1. #11
    Mo' Programming Mo' Problems
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    Sonicxtacy02's Avatar
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    needless to say i still dont get it lol: i've got another slightly different formula i need help with. Same scenario only not dealing with percentages

    X= ((160 * 2.5)-100) * 0.145

    in the above function X = 43.5. I need to the solve an equation which gives me X but not "160"... so like this

    43.5 = ((X * 2.5)-100) * 0.145

    So how do i solve for X in that second equation
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  2. #12
    What can I say? I like serial. Curiosity's Avatar
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    Are you reversing the math? The easiest way to think about it is to break it down and reverse each basic equation.
    X = n * 2.5 reversed is n = X / 2.5 and keep going...

    A = 160 * 2.5
    B = A - 100
    X = B * 0.145

    reverse...

    D = X / 0.145
    E = D + 100
    F = E / 2.5

    So now F = 160

    Now put it all back together

    X = ( (43.5 / 0.145) + 100 ) / 2.5

  3. #13
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    well that took me awhile but now i get it. Thanks for the insight Curiosity!
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  4. #14
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    I used to just draw a triangle and put the three numbers inside. 1 number at the top and 2 numbers in the bottom corners. So say you have A at the top, B in the left corner and C in the right corner. You can visually see how the equation changes:
    A = B * C
    B = A / C
    C = A / B
    I used that for years.
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  5. #15
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    In college i majored in Business Admin AND Info technology. If i ever go back i'll major in mathematics lol. I always get caught up with this kinda stuff in my programming.
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  6. #16
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    It's been a while, but here's another way to go about solving equations (just in case it comes up again....)

    First off somethings to remember:

    1. Any changes you do to one side of an equation make sure you do it to the other
    2. As long as you remember #1, reducing a term to 1 (when division or multiplication is at play) or 0 (for addition/subtraction) is a good thing.

    Ok given the above and the starting equation [ 43.5 = ((X * 2.5)-100) * 0.145
    ] -- Let's apply these rules, remembering that we are solving for X:

    step 1: 43.5 / 0.145 = ((X * 2.5)-100) * (0.145 / 0.145) [ dividing by 0.145 by 0.145 is 1 and since we did this on one side must apply it to the other]

    step 2: (43.5/0.145) + 100 = x*2.5 - 100 + 100 [ adding 100 to -100 is 0, done on one side must be done on the other ]

    step 3: ((43.5/0.145) + 100) / 2.5 = x [hopefully you follow by now....]

    These steps would have helped in any of these type of equations.

  7. #17
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    Quote Originally Posted by Maheriano View Post
    I used to just draw a triangle and put the three numbers inside. 1 number at the top and 2 numbers in the bottom corners. So say you have A at the top, B in the left corner and C in the right corner. You can visually see how the equation changes:
    A = B * C
    B = A / C
    C = A / B
    I used that for years.
    Hopefully you found your answer, I don't have the level of math to resolve this.

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