Respuesta:
=30x^2-10xy-13y^2
Explicación paso a paso:
[tex](7x^{2} +8xy-9y^{2} )+(23x^{2} -18xy-4y^{2})\\=7x^{2} +8xy-9y^{2} +23x^{2} -18xy-4y^{2}\\=7x^{2} +23x^{2}+8xy-18xy-9y^{2} -4y^{2}\\=30x^{2} -10xy -13y^{2}\\[/tex]
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Respuesta:
=30x^2-10xy-13y^2
Explicación paso a paso:
[tex](7x^{2} +8xy-9y^{2} )+(23x^{2} -18xy-4y^{2})\\=7x^{2} +8xy-9y^{2} +23x^{2} -18xy-4y^{2}\\=7x^{2} +23x^{2}+8xy-18xy-9y^{2} -4y^{2}\\=30x^{2} -10xy -13y^{2}\\[/tex]