Respuesta :

To solve this equation, the first step is to factor the term

[tex]x^2+4x-21=(x+7)(x-3)=0[/tex]

Now, equal each factor to 0 and clear x

[tex]\begin{gathered} x+7=0 \\ x=-7 \\ x-3=0 \\ x=3 \end{gathered}[/tex]

The equation has 2 roots, x=-7 and x=3

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