Find the value(s) of k if the quadratic equation3 3 4 02x k x− + = has real roots.
Question
Find the value(s) of k if the quadratic equation3 3 4 02x k x− + = has real roots.
Solution
Para que la ecuación cuadrática tenga raíces reales, el discriminante debe ser mayor o igual a cero. El discriminante de una ecuación cuadrática está dado por .
En este caso, , , y . Entonces, el discriminante es:
Simplificamos:
Para que la ecuación tenga raíces reales, el discriminante debe ser mayor o igual a cero:
Resolvemos esta desigualdad:
Dividimos ambos lados por 9:
Tomamos la raíz cuadrada de ambos lados:
Simplificamos la raíz cuadrada:
Sabemos que , entonces:
Esto significa que debe ser mayor o igual a o menor o igual a . Por lo tanto, los valores de que satisfacen la condición son:
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