if a^2-2ab+b^2=ab which of the following is equivalent to a^2+b^2

the answer is 3ab but i dont know how

Add 2*ab* to both sides to combine like terms (i.e. get all the *ab* terms on the same side of the equals sign):

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if a^2-2ab+b^2=ab which of the following is equivalent to a^2+b^2

the answer is 3ab but i dont know how

Add 2*ab* to both sides to combine like terms (i.e. get all the *ab* terms on the same side of the equals sign):