Respuesta :

In order to have a perfect square trinomial, we need to find the value of n

[tex]a^2+2ab+b^2[/tex]

´where

a=x

b=-20

so

[tex]\begin{gathered} x^2+2(-20)x+(-20)^2 \\ x^2-40x+400 \end{gathered}[/tex]

the value of n=400

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