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Old 2017-09-14, 07:09   #3
retina
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Jun 2006
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Quote:
Originally Posted by jwaltos View Post
-2*x^3+(19/2-60*a-60*b*y)*x^2+(21/2+314*a+30*d*y+30*c+314*b*y)*x+2+205*a+11*c+900*b*y*c+420*a*b*y+210*a^2+210*b^2*y^2+11*d*y+900*a*d*y+900*b*y^2*d+205*b*y+900*a*c


Assuming a, b, c and d are known, what is the best method to resolve the remaining variables: x, y, such that the resulting number is a specific integer.
You can replace x and y with any value you like. Simplifying and coalescing all the constants gives this formula:

f(x,y) = a*x^3 + (b+c*y)*x^2 + (d+e*y)*x + f*y^2 + g*y + h

Last fiddled with by retina on 2017-09-14 at 07:10
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