Respuesta:
[tex]9x^{2} -49[/tex]
Explicación paso a paso:
[tex](3x+7)(3x-7)\\(a-b)(a+b)=a^{2} -b^{2} \\(3x)^{2} -7^{2} \\9x^{2} -49[/tex]
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Respuesta:
[tex]9x^{2} -49[/tex]
Explicación paso a paso:
[tex](3x+7)(3x-7)\\(a-b)(a+b)=a^{2} -b^{2} \\(3x)^{2} -7^{2} \\9x^{2} -49[/tex]