Respuesta :

Hi1315

Step-by-step explanation:

[tex] {x}^{2} + 5 = 7 \\ {x}^{2} = 7 - 5 \\ {x}^{2} = 2 \\ \\( {x}^{2} + 5)k = 21 \\ (2 + 5)k = 21 \\ (7)k = 21 \\ 7k = 21 \\ \frac{7k}{7} = \frac{21}{7} \\ k = 3[/tex]

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