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4a^{2}+9b^{2} -x^{2} -1+12ab-2xy can someone explain this pls it's hurting my brain:,)
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4a^{2}+9b^{2} -x^{2} -1+12ab-2xy

can someone explain this pls it's hurting my brain:,)

User Julien METRAL
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it’s an expression. there is no like terms within the expression so it remains the same. each variable is different because of either the “a, b, x, y” or the squared.
User ArranJacques
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