2 answers:
6m^2n^2 - 3mn + 4mn + 13m^2n^2 + 9
combine like terms
19m^2n^2 + mn + 9 <==
<span>6m</span>²<span>n</span>²<span>-3mn+4mn+13m</span>²<span>n</span>²<span>+9 =
(6m</span>²n²+13m²n²<span>)+(4mn-3mn)+9=
19m</span>²n²+mn+9
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