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Which function do I need to rearrange a symbolic expression?

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Lockywolf
Lockywolf 2017-7-31
回答： Walter Roberson 2017-7-31
I have an expression of the form:
4t(a+b-c)^2 + (x-a)^2 + (y-b)^2 + (z-c)^2
I need to rearrange it to the form:
(something_without_c) + (c - something_without_c)^2
(And later to something like:
(a - something_without_a_or_b_or_c)^2 + (b - something_without_b_or_c)^2 + (c - something_without_c)^2 ) + something_without_a_or_b_or_c)
This is clearly achievable manually, but coefficients are cumbersome, so I am looking for some machine aid.
Any suggestions?

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Walter Roberson
Walter Roberson 2017-7-31
You might be able to take advantage of isolate or coeffs

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