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in order to complete square you need to group terms containing x variable and add missing part to get form a^2+2ab+b^2=(a+b)^2then you need subtract same squared number (b^2) as well in order to not to change original expression
in order to complete square you need to group terms containing x variable and add missing part to get form a^2+2ab+b^2=(a+b)^2
then you need subtract same squared number (b^2) as well in order to not to change original expression