Multiply polynomial $ \, \color{blue}{ 2x+3 } \, $ by $ \, \color{orangered}{ 5x-3 }$.

$$ \left( \color{blue}{2x+3} \right) \cdot \left( \color{orangered}{5x-3} \right) = 10x^2+9x-9 $$

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

$$ \begin{aligned} \left( \color{blue}{ 2x+3}\right) \cdot \left( \color{orangered}{ 5x-3}\right) &= \underbrace{ \color{blue}{2x} \cdot \color{orangered}{5x} }_{\text{FIRST}} + \underbrace{ \color{blue}{2x} \cdot \left( \color{orangered}{-3} \right) }_{\text{OUTER}} + \underbrace{ \color{blue}{3} \cdot \color{orangered}{5x} }_{\text{INNER}} + \underbrace{ \color{blue}{3} \cdot \left( \color{orangered}{-3} \right) }_{\text{LAST}} = \\ &= 10x^2 + \left( -6x\right) + 15x + \left( -9\right) = \\ &= 10x^2 + \left( -6x\right) + 15x + \left( -9\right) = \\ &= 10x^2+9x-9; \end{aligned} $$

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