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Math Help - Solving quadratic equations

  1. #1
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    Solving quadratic equations

    I was solving this problem and ended up with 1.025^n=0.71+0.05n
    I tried solving this equation for like 15 minutes with no use... can you please tell me how to solve it?

    Thanks
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  2. #2
    MHF Contributor Amer's Avatar
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    Re: Solving quadratic equations

    here see wolfarm
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  3. #3
    MHF Contributor Also sprach Zarathustra's Avatar
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    Re: Solving quadratic equations

    Quote Originally Posted by IBstudent View Post
    I was solving this problem and ended up with 1.025^n=0.71+0.05n
    I tried solving this equation for like 15 minutes with no use... can you please tell me how to solve it?

    Thanks

    15 min. is nothing! What is the original problem?

    1.025^n=0.71+0.05n - Wolfram|Alpha
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  4. #4
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    Re: Solving quadratic equations

    The question is complicated, I am sure that you start with 1200000(1.025)^n/(1420+100n)=600

    Can you please show me how to work this out?

    Thanks in advance
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  5. #5
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    Re: Solving quadratic equations

    Quote Originally Posted by IBstudent View Post
    The question is complicated, I am sure that you start with 1200000(1.025)^n/(1420+100n)=600

    Can you please show me how to work this out?

    Thanks in advance
    First off, your post title is misleading. This equation is exponential, not quadratic.

    Note that elementary algebraic methods will not work in finding a solution by hand.

    I advise the use of technology to solve the equation. Another poster has provided you a link to that end.
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  6. #6
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    Re: Solving quadratic equations

    May I ask why you title this "Solving quadratic equations"? This is certainly not a quadratic equation. It is not even a polynomial equation.

    The point the others are making is that there is no simple formula that will give you an exact answer. Probably the simplest thing to do is to graph y= 1.025^n and y= 0.71+ .05n on some kind of calculator or computer graphics system and "zoom" in on a point where they intersect.

    You could also use some kind of numerical method such as Newton's method to find a numerical problem.
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