Respuesta :

shadieann

Step-by-step explanation:

[tex] {12}^{2} + {9}^{2} = {a}^{2} \\ 144 + 81 = {a}^{2} \\ {a}^{2} = 225 \\ a = 15[/tex]

benjaT2525

Answer:

a = 15

a = - 15

Step-by-step explanation:

Exponentiation

12² + 9² = a²

144 + 9² = a²

so a equal to 15, -15