Trying to avoid the quartic formula

jeudi 26 juin 2014

I need help solving for t in the following equation,



[tex]|P + Vt + A(t^2)/2| = st[/tex]



where P V and A are vectors and s and t are scalars.



I've tried squaring both sides which results in the equation



[tex](|A|^2/4)t^4+V.Gt^3+(P.G+|V|^2)t^2+2P.Vt + |P|^2 = s^2t^2[/tex]



[tex](|A|^2/4)t^4+V.Gt^3+(P.G+|V|^2-s^2)t^2+2P.Vt+|P|^2=0[/tex]



The only way I can think to solve this is through the quartic formula which is too unwieldy for my purposes and was wondering if anyone had any ideas.





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