Cero real de una función
Un cero real de una función es un número real que hace el valor de la función igual a cero.
Un número real, r , es un cero de una función f , si f ( r ) = 0.
Ejemplo:
f ( x ) = x 2 – 3 x + 2
Encuentre x tal que f ( x ) = 0.
0 = x 2 – 3 x + 2
0 = ( x – 2)( x – 1)
x = 2 o x = 1
f (2) = 2 2 – 3(2) + 2 = 0
f (1) = 1 2 – 3(1) + 2 = 0
Ya que f (2) = 0 y f (1) = 0, tanto 2 como 1 son ceros reales de la función.
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