Respuesta :
Answer:
k = -9
Step-by-step explanation:
[tex]x^{2} -9=x^{2} + k\\[/tex]
subtract [tex]x^{2}[/tex] from each side
-9 = k
k = -9
Answer:
k = -9
Step-by-step explanation:
[tex]x^{2} -9=x^{2} + k\\[/tex]
subtract [tex]x^{2}[/tex] from each side
-9 = k
k = -9