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answered 2017-05-03 01:38:37 +0100
Knowing the outcome you can do:
var('b f k') expr = 2*b*f^2 + f^2*k - 2*b*f- f^2 - 2*f*k + b+2*f+k - 1 (expr - b*f^2).factor() + b*f^2