Please explain thoroughly how to solve this! I do not understand how to do this.

42 Which graph best represents an equation that has the roots x= -7/2 and x=1/2?

Fhttp://ritter.tea.state.tx.us/studen...2graphica1.gif

Ghttp://ritter.tea.state.tx.us/studen...2graphica2.gif

Hhttp://ritter.tea.state.tx.us/studen...2graphica3.gif

Jhttp://ritter.tea.state.tx.us/studen...2graphica4.gif