Question
Find roots of polynomial $$ p(x) = 72x+84 $$
Answer
The root of polynomial $ p(x) $ is:
$$ \begin{aligned}x &= -\dfrac{ 7 }{ 6 } \end{aligned} $$Explanation
$$ \begin{aligned} 72x+84 & = 0 \\[1 em]
72 \cdot x & = -84 \\[1 em]
x & = - \frac{ 84 }{ 72 } \\[1 em]
x & = - \frac{ 84 : 12 }{ 72 : 12} \\[1 em]
x & = -\frac{ 7 }{ 6 }
\end{aligned} $$
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