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(-x+6)²
(-x)²+2(-x)(6)+(6)²
x²-12x+36
(y-9)²
(y)²+2(y)(-9)+(9)²
y²-18y+81
(n-12)²
(n)²+2(n)(-12)+(12)²
n²-24n+144
espero ayude
-x+6 y-9 n-12
-x+6 y-9 n-12
____ _____ ______
x²-6x y²-9y n²-12n
-6x+36 -9y+81 -12n+144
________ ________ ___________
x²-12x+36 y²-18y+81 n²-24n+144
lo de negrilla es el resultado