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Objetivo: Resolver ecuaciones de segundo grado del tipo $ax^2+bx=0$.

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2)  Determine las raíces de la ecuación de segundo grado $5x^2+20x=0$

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     A)  $0$  y  $4$

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     B)  $0$  y  $-4$

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     C)  $-2$  y  $2$ 

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     D)  $-2i$  y  $2i$

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Para resolver la ecuación de segundo grado $5x^2+20x=0$ debemos seguir los siguientes pasos:

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$5x^2+20x=0$

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[[0]]$x \\cdot(x+$[[1]]$)=0$

\n		Paso 1: Debemos factorizar la expresión $5x^2+20x=0$, observando que su factor común es [[0]]$\\cdot x$, además es posible obtener que el otro factor es igual a $(x+$[[1]]$)=0$.
[[0]]$x=0$  y  $(x+$[[1]]$)=0$\n

Paso 2: Como [[0]]$x$ y $(x+$[[1]]$)$ multiplicadas son igual a , por propiedad dos números multiplicados dan  si uno de los dos es , obteniendo así las ecuaciones

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$x=$[[2]]   y  $x=$[[3]]

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Paso 3: Se resuelven las ecuaciones del paso 2 obteniendo las dos soluciones buscadas.  

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La respuesta correcta es la alternativa: [[4]]

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B)  $0$  y  $-4$

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