Find roots of polynomial $$ p(x) = 2x+2x+4 $$

The root of polynomial $ p(x) $ is:

$$ \begin{aligned}x &= -1 \end{aligned} $$

Step 1:

Combine like terms:

$$ \color{blue}{2x} + \color{blue}{2x} +4 = \color{blue}{4x} +4 $$

Step 2:

$$ \begin{aligned} 4x+4 & = 0 \\[1 em] 4 \cdot x & = -4 \\[1 em] x & = - \frac{ 4 }{ 4 } \\[1 em] x & = - \frac{ 4 : 4 }{ 4 : 4} \\[1 em] x & = -1 \end{aligned} $$

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