Find $ \left(x+2\right)^2 $ using formula.

$$ (A + B)^2 = \color{blue}{A^2} + 2 \cdot A \cdot B + \color{red}{B^2} $$

where $ A = \color{blue}{ x } $ and $ B = \color{red}{ 2 }$.

$$ \begin{aligned}\left(x+2\right)^2 = \color{blue}{x^2} +2 \cdot x \cdot 2 + \color{red}{2^2} = x^2+4x+4\end{aligned} $$

Multiply each term of $ \left( \color{blue}{x+17}\right) $ by each term in $ \left( x^2+4x+4\right) $.

$$ \left( \color{blue}{x+17}\right) \cdot \left( x^2+4x+4\right) = x^3+4x^2+4x+17x^2+68x+68 $$

Combine like terms:

$$ x^3+ \color{blue}{4x^2} + \color{red}{4x} + \color{blue}{17x^2} + \color{red}{68x} +68 = x^3+ \color{blue}{21x^2} + \color{red}{72x} +68 $$

Multiply each term of $ \left( \color{blue}{x^3+21x^2+72x+68}\right) $ by each term in $ \left( x-7\right) $.

$$ \left( \color{blue}{x^3+21x^2+72x+68}\right) \cdot \left( x-7\right) = x^4-7x^3+21x^3-147x^2+72x^2-504x+68x-476 $$

Combine like terms:

$$ x^4 \color{blue}{-7x^3} + \color{blue}{21x^3} \color{red}{-147x^2} + \color{red}{72x^2} \color{green}{-504x} + \color{green}{68x} -476 = \\ = x^4+ \color{blue}{14x^3} \color{red}{-75x^2} \color{green}{-436x} -476 $$

Multiply each term of $ \left( \color{blue}{x^4+14x^3-75x^2-436x-476}\right) $ by each term in $ \left( x-9\right) $.

$$ \left( \color{blue}{x^4+14x^3-75x^2-436x-476}\right) \cdot \left( x-9\right) = \\ = x^5-9x^4+14x^4-126x^3-75x^3+675x^2-436x^2+3924x-476x+4284 $$

Combine like terms:

$$ x^5 \color{blue}{-9x^4} + \color{blue}{14x^4} \color{red}{-126x^3} \color{red}{-75x^3} + \color{green}{675x^2} \color{green}{-436x^2} + \color{orange}{3924x} \color{orange}{-476x} +4284 = \\ = x^5+ \color{blue}{5x^4} \color{red}{-201x^3} + \color{green}{239x^2} + \color{orange}{3448x} +4284 $$