Respuesta :
ANSWER
a=9
EXPLANATION
The given quadratic equation is
[tex] {(x + 2)}^{2} = a[/tex]
If x=1 is a solution, then it must satisfy this equation:
[tex]{(1 + 2)}^{2} = a[/tex]
[tex] {3}^{2} = a[/tex]
[tex]a = 9[/tex]
Therefore the value of 'a' is 9