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Math Help - Expanding root term

  1. #1
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    Expanding root term

    Hi all,

    This may not quite be an advanced algebraic problem but has been puzzling me for ages now, so though i'd seek help.

    So here goes:


    I have the equation:

    Q = C * ( sqrt ( P1 - P2 ) )

    C is constant, P1 and P2 are inputs

    Is there a way of rearranging as to seperate P1 and P2 so that the sqrt operation occurs afterwards. The reason for this being that they are pressure inputs into a state space system (simplified - dynamics are there).

    Many thanks for any replies in advance
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  2. #2
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    addition comment to previous question

    Sorry, just an addition to the original problem:

    I had thought that the equivilent would be:

    Q^2 = (C^2* P1) - (C^2*P2),

    However, as it is part of a state space matrix, is there a way to manipulate Q further (in output eq'n y = Cx or otherwise)?

    Kind regards, and many thanks in advance again.
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  3. #3
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by pjb11001010 View Post
    Hi all,

    This may not quite be an advanced algebraic problem but has been puzzling me for ages now, so though i'd seek help.

    So here goes:


    I have the equation:

    Q = C * ( sqrt ( P1 - P2 ) )

    C is constant, P1 and P2 are inputs

    Is there a way of rearranging as to seperate P1 and P2 so that the sqrt operation occurs afterwards. The reason for this being that they are pressure inputs into a state space system (simplified - dynamics are there).

    Many thanks for any replies in advance
    what about this?

    Q = C \sqrt {P_1 - P_2}

    \Rightarrow \frac {Q}{C} = \sqrt {P_1 - P_2}

    \Rightarrow \frac {Q^2}{C^2} = P_1 - P_2

    \Rightarrow \boxed { P_1 = P_2 + \frac {Q^2}{C^2}}

    or

    \boxed { P_1 = P_2 + \left( \frac {Q}{C} \right)^2 }
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