Does anyone have any idea how to factorize the following? a^2+3b^2+4ab+2ac+6bc-4b+4c-4 Help would be very much appreciated :) thank you!

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add  and subtract b^2 from the given term and group the terms a^2+3b^2+b^2+4ab-(b^2+4b+4)+2c(a+3b+2) (a+2b)^2-(b+2)^2+2c(a+3b+2)