Question
Find roots of polynomial $$ p(x) = 3x+9 $$
Answer
The root of polynomial $ p(x) $ is:
$$ \begin{aligned}x &= -3 \end{aligned} $$Explanation
$$ \begin{aligned} 3x+9 & = 0 \\[1 em]
3 \cdot x & = -9 \\[1 em]
x & = - \frac{ 9 }{ 3 } \\[1 em]
x & = - \frac{ 9 : 3 }{ 3 : 3} \\[1 em]
x & = -3
\end{aligned} $$
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