Multiply polynomial $ \, \color{blue}{ 2x+2x+1 } \, $ by $ \, \color{orangered}{ x-1 }$.

$$ \left( \color{blue}{2x+2x+1} \right) \cdot \left( \color{orangered}{x-1} \right) = 4x^2-3x-1 $$

Step 1: First we have to write polynomials in descending order.

$$ \begin{aligned} P(x) &= 4x+1 \\ Q(x) &= x-1 \\ \end{aligned} $$

In this example we are multiplying two binomials so FOIL method can be used.

$$ \begin{aligned} \left( \color{blue}{ 4x+1}\right) \cdot \left( \color{orangered}{ x-1}\right) &= \underbrace{ \color{blue}{4x} \cdot \color{orangered}{x} }_{\text{FIRST}} + \underbrace{ \color{blue}{4x} \cdot \left( \color{orangered}{-1} \right) }_{\text{OUTER}} + \underbrace{ \color{blue}{1} \cdot \color{orangered}{x} }_{\text{INNER}} + \underbrace{ \color{blue}{1} \cdot \left( \color{orangered}{-1} \right) }_{\text{LAST}} = \\ &= 4x^2 + \left( -4x\right) + x + \left( -1\right) = \\ &= 4x^2 + \left( -4x\right) + x + \left( -1\right) = \\ &= 4x^2-3x-1; \end{aligned} $$

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