Respuesta :

Answer:

the answer is 9

Step-by-step explanation:

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adelaidavis

Answer:

a=9

Step-by-step explanation:

Let's break this down:

We know x=1, so we can substitute that in to get;

(1+2)^2=a

1+2=3, which gives us,

(3)^2=a

3 squared is 9

Therefore, a=9.

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