Respuesta :

Answer:

[tex]{ \tt{k = ( - \frac{1}{2} + 7) { }^{ - 2} + 105 {}^{0} }} \\ \\ { \tt{k = {( \frac{13}{2} )}^{ - 2} + 1 }} \\ \\ { \tt{k = {( \frac{2}{13}) }^{2} + 1}} \\ \\ { \tt{k = \frac{4}{169} + 1 }} \\ \\ { \tt{k = \frac{173}{169} }}[/tex]