Explicación paso a paso:
[tex]a.\:({x}^{2}+4)\\b.\:({4y}^{2}+{16x}^{2})\\c.\:({4x}^{2}+4)\\d.\:({36m}^{2}-16)\\e. \:({a}^{2}-{b}^{2})\\f.\:(9+{x}^{2})\\g.\:({a}^{2}+{r}^{2})\\h.\:({x}^{2}+9)\\i.({a}^{2}+{4b}^{2})\\j.({x}^{2}+{y}^{2})[/tex]
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Explicación paso a paso:
[tex]a.\:({x}^{2}+4)\\b.\:({4y}^{2}+{16x}^{2})\\c.\:({4x}^{2}+4)\\d.\:({36m}^{2}-16)\\e. \:({a}^{2}-{b}^{2})\\f.\:(9+{x}^{2})\\g.\:({a}^{2}+{r}^{2})\\h.\:({x}^{2}+9)\\i.({a}^{2}+{4b}^{2})\\j.({x}^{2}+{y}^{2})[/tex]