Finding a value in an Implicit Function

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Yianni
Yianni 2014-11-7
编辑： per isakson 2014-11-7
I have a Function below of which I am trying to find the independent variable (x) when I am given the dependent variable (W) of an equation. For my situation,W = 250 and I need to find x somehow with the function:
function W = weight(x)
a = 0.15;
b = 0.05;
K = 2800;
L = sqrt(a^2+(b+x)^2);
Lo = sqrt(a^2+b^2);
dL = L-Lo;
SINtheta = (b+x)/L;
W = 2*K*dL*SINtheta;
end
I cannot rearrange the equation for this question and I was told that maybe a Secant Method could work for this but I have not had much luck.

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