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Desarrollando X^2 + 8x +16
(a-5)^2
Desarrollando a^2-10a+25
Recuerda (a+b)^2 = a^2+2a.b+b^2
(a-b)^2 = a^2-2a.b+b^2
(X+4)
+2(X)(4)+=+8x+16
(a-5)
-2(a)(5)+=-10a+25