Re: two quadratic eq, please help

[Vic Norton]

You don't need octave for this. It is a 
straightforward application of the quadratic 
formula:  x = (- b ± sqrt( b^2 - 4ac))/2a.

Expand the equations and eliminate the square 
terms between them. This leaves the equation of a 
line. Solve the linear equation for y in terms of 
x, and substitute this y in either of your 
quadratic equations. Now you have a quadratic 
equation in x. Solve this equation with the 
quadratic formula and compute the solution y's 
corresponding to the solution x's.

Regards,

Vic

At 12:25 AM -0800 2/6/05, shih lin wrote:
> dear octave and math programmers:
>
>   highly appreciate anyone can tell me how (or hint) to use octave to
> solve:(12-x)^2 + y^2 =15^2, (16+y)^2+x^2=25^2 
> (by programming or using its built
> in function)?
> that ^2 mean square.
> looking to any math&programer's help,
>  eric, address@hidden



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